Sega / Panini (Japan) - World Club Champion Football 2011-2012 - China

2012
World Club Champion Football Intercontinental Clubs 2011-2012 - China
Sega / Panini
China
336+ cards

I knew that a few of the WCCF series of cards had been available in China, but until I received an e-mail from Thomas Ott recently I didn't know the cards were different. Thomas has sent in scans of his Toni Kroos cards to highlight the differences between the original Japanese version and the Chinese cards. The base set of the Japanese cards are numbered to 384 but the Chinese cards are numbered to 336. It's also possible that the Superstars, Legends and MVP card were also available in the Chinese version, identified by the other subtle differences between the Japanese and Chinese versions. The card on the left is Japanese and the card on the right is Chinese.
I haven't been able to compile a checklist, in fact I haven't been able to find any further information so this is an appeal for help. If you can add to this list please get in touch.
UPDATE (11-08-2020 13:45):  Theo Reiker has done an amazing job compiling checklists for two of the WCCF collections that were issued in China. Both have less cards than the Japanese versions. The first number is the Chinese card number, the number in brackets is the card number for the Japanese version.

World Club Champion Football 2011-2012 - China
336 cards

001/336 (001/384).  Wojciech Szczesny (Arsenal FC)
002/336 (002/384).  Andre Santos (Arsenal FC)
003/336 (003/384).  Kieran Gibbs (Arsenal FC)
004/336 (004/384).  Laurent Koscielny (Arsenal FC)
005/336 (005/384).  Per Mertesacker (Arsenal FC)
006/336 (006/384).  Bacary Sagna (Arsenal FC)
007/336 (007/384).  Thomas Vermaelen (Arsenal FC)
008/336 (008/384).  Mikel Arteta (Arsenal FC)
009/336 (009/384).  Aaron Ramsey (Arsenal FC)
010/336 (010/384).  Alex Song (Arsenal FC)
011/336 (011/384).  Jack Wilshere (Arsenal FC)
012/336 (012/384).  Gervinho (Arsenal FC)
013/336 (013/384).  Ryo Miyaichi (Arsenal FC)
014/336 (014/384).  Alex Oxlade-Chamberlain (Arsenal FC)
015/336 (015/384).  Robin van Persie (Arsenal FC)
016/336 (016/384).  Theo Walcott (Arsenal FC)
017/336 (017/384).  Petr Cech (Chelsea FC)
018/336 (018/384).  José Bosingwa (Chelsea FC)
019/336 (019/384).  Gary Cahill (Chelsea FC)
020/336 (020/384).  Ashley Cole (Chelsea FC)
021/336 (021/384).  David Luiz (Chelsea FC)
022/336 (022/384).  Branislav Ivanovic (Chelsea FC)
023/336 (023/384).  John Terry (Chelsea FC)
024/336 (024/384).  Frank Lampard (Chelsea FC)
025/336 (025/384).  Raúl Meireles (Chelsea FC)
026/336 (026/384).  John Obi Mikel (Chelsea FC)
027/336 (027/384).  Ramires (Chelsea FC)
028/336 (028/384).  Oriol Romeu (Chelsea FC)
029/336 (029/384).  Didier Drogba (Chelsea FC)
030/336 (030/384).  Fernando Torres (Chelsea FC)
031/336 (031/384).  Juan Manuel Mata (Chelsea FC)
032/336 (032/384).  Daniel Sturridge (Chelsea FC)
033/336 (033/384).  Joe Hart (Manchester City FC)
034/336 (034/384).  Gaël Clichy (Manchester City FC)
035/336 (035/384).  Vincent Kompany (Manchester City FC)
036/336 (036/384).  Joleon Lescott (Manchester City FC)
037/336 (037/384).  Micah Richards (Manchester City FC)
038/336 (038/384).  Pablo Zabaleta (Manchester City FC)
039/336 (039/384).  Gareth Barry (Manchester City FC)
040/336 (040/384).  Nigel De Jong (Manchester City FC)
041/336 (041/384).  Adam Johnson (Manchester City FC)
042/336 (042/384).  James Milner (Manchester City FC)
043/336 (043/384).  Samir Nasri (Manchester City FC)
044/336 (044/384).  David Silva (Manchester City FC)
045/336 (045/384).  Yaya Touré (Manchester City FC)
046/336 (046/384).  Mario Balotelli (Manchester City FC)
047/336 (047/384).  Edin Džeko (Manchester City FC)
048/336 (048/384).  Sergio Kun Agüero (Manchester City FC)
049/336 (049/384).  David De Gea (Manchester United FC)
050/336 (050/384).  Patrice Evra (Manchester United FC)
051/336 (051/384).  Rio Ferdinand (Manchester United FC)
052/336 (052/384).  Phil Jones (Manchester United FC)
053/336 (053/384).  Chris Smalling (Manchester United FC)
054/336 (054/384).  Nemanja Vidic (Manchester United FC)
055/336 (055/384).  Michael Carrick (Manchester United FC)
056/336 (056/384).  Tom Cleverley (Manchester United FC)
057/336 (057/384).  Ryan Giggs (Manchester United FC)
058/336 (058/384).  Nani (Manchester United FC)
059/336 (059/384).  Ji-Sung Park (Manchester United FC)
060/336 (060/384).  Antonio Valencia (Manchester United FC)
061/336 (061/384).  Ashley Young (Manchester United FC)
062/336 (062/384).  Javier Hernandez (Manchester United FC)
063/336 (063/384).  Wayne Rooney (Manchester United FC)
064/336 (064/384).  Danny Welbeck (Manchester United FC)
065/336 (065/384).  Mickaël Landreau (Lille OSC)
066/336 (066/384).  Marko Basa (Lille OSC)
067/336 (067/384).  Franck Beria (Lille OSC)
068/336 (068/384).  Aurélien Chedjou (Lille OSC)
069/336 (069/384).  Mathieu Debuchy (Lille OSC)
070/336 (070/384).  David Rozehnal (Lille OSC)
071/336 (071/384).  Florent Balmont (Lille OSC)
072/336 (072/384).  Joe Cole (Lille OSC)
073/336 (073/384).  Eden Hazard (Lille OSC)
074/336 (074/384).  Rio Antonio Mavuba (Lille OSC)
075/336 (075/384).  Ludovic Obraniak (Lille OSC)
076/336 (076/384).  Benoît Pedretti (Lille OSC)
077/336 (077/384).  Ireneusz Jelen (Lille OSC)
078/336 (078/384).  Dimitri Payet (Lille OSC)
079/336 (079/384).  Ronny Rodelin (Lille OSC)
080/336 (080/384).  Moussa Sow (Lille OSC)
081/336 (081/384).  Bernd Leno (Bayer 04 Leverkusen)
082/336 (082/384).  Gonzalo Castro (Bayer 04 Leverkusen)
083/336 (083/384).  Vedran Corluka (Bayer 04 Leverkusen)
084/336 (084/384).  Michal Kadlec (Bayer 04 Leverkusen)
085/336 (085/384).  Stefan Reinartz (Bayer 04 Leverkusen)
086/336 (086/384).  Daniel Schwaab (Bayer 04 Leverkusen)
087/336 (087/384).  Ömer Toprak (Bayer 04 Leverkusen)
088/336 (088/384).  Hanno Balitsch (Bayer 04 Leverkusen)
089/336 (089/384).  Michael Ballack (Bayer 04 Leverkusen)
090/336 (090/384).  Lars Bender (Bayer 04 Leverkusen)
091/336 (091/384).  Renato Augusto (Bayer 04 Leverkusen)
092/336 (092/384).  Simon Rolfes (Bayer 04 Leverkusen)
093/336 (093/384).  Sidney Sam (Bayer 04 Leverkusen)
094/336 (094/384).  Eren Derdiyok (Bayer 04 Leverkusen)
095/336 (095/384).  Stefan Kießling (Bayer 04 Leverkusen)
096/336 (096/384).  André Schürrle (Bayer 04 Leverkusen)
097/336 (097/384).  Roman Weidenfeller (Borussia Dortmund)
098/336 (098/384).  Mats Hummels (Borussia Dortmund)
099/336 (099/384).  Lukasz Piszczek (Borussia Dortmund)
100/336 (100/384).  Marcel Schmelzer (Borussia Dortmund)
101/336 (101/384).  Neven Subotic (Borussia Dortmund)
102/336 (102/384).  Sven Bender (Borussia Dortmund)
103/336 (103/384).  Jakub Blaszczykowski(Borussia Dortmund)
104/336 (104/384).  Mario Götze (Borussia Dortmund)
105/336 (105/384).  Kevin Großkreutz (Borussia Dortmund)
106/336 (106/384).  Ilkay Gündogan (Borussia Dortmund)
107/336 (107/384).  Shinji Kagawa (Borussia Dortmund)
108/336 (108/384).  Sebastian Kehl (Borussia Dortmund)
109/336 (109/384).  Moritz Leitner (Borussia Dortmund)
110/336 (110/384).  Ivan Perisic (Borussia Dortmund)
111/336 (111/384).  Lucas Barrios (Borussia Dortmund)
112/336 (112/384).  Robert Lewandowski (Borussia Dortmund)
113/336 (113/384).  Manuel Neuer (FC Bayern Munchen)
114/336 (114/384).  Holger Badstuber (FC Bayern Munchen)
115/336 (115/384).  Jérôme Boateng (FC Bayern Munchen)
116/336 (116/384).  Philipp Lahm (FC Bayern Munchen)
117/336 (117/384).  Rafinha (FC Bayern Munchen)
118/336 (118/384).  Daniel Van Buyten (FC Bayern Munchen)
119/336 (119/384).  Toni Kroos (FC Bayern Munchen)
120/336 (120/384).  Luiz Gustavo (FC Bayern Munchen)
121/336 (121/384).  Franck Ribéry (FC Bayern Munchen)
122/336 (122/384).  Arjen Robben (FC Bayern Munchen)
123/336 (123/384).  Bastian Schweinsteiger(FC Bayern Munchen)
124/336 (124/384).  Anatoliy Tymoshchuk (FC Bayern Munchen)
125/336 (125/384).  Takashi Usami (FC Bayern Munchen)
126/336 (126/384).  Mario Gomez (FC Bayern Munchen)
127/336 (127/384).  Thomas Müller (FC Bayern Munchen)
128/336 (128/384).  Nils Petersen (FC Bayern Munchen)
129/336 (145/384).  Kenneth Vermeer (AFC Ajax)
130/336 (146/384).  Toby Alderweireld (AFC Ajax)
131/336 (147/384).  Daley Blind (AFC Ajax)
132/336 (148/384).  Nicolai Boilesen (AFC Ajax)
133/336 (149/384).  Gregory Van Der Wiel (AFC Ajax)
134/336 (150/384).  Jan Vertonghen (AFC Ajax)
135/336 (151/384).  Vurnon Anita (AFC Ajax)
136/336 (152/384).  Siem De Jong (AFC Ajax)
137/336 (153/384).  Eyong Enoh (AFC Ajax)
138/336 (154/384).  Christian Eriksen (AFC Ajax)
139/336 (155/384).  Theo Janssen (AFC Ajax)
140/336 (156/384).  Nicolás Lodeiro (AFC Ajax)
141/336 (157/384).  Derk Boerrigter (AFC Ajax)
142/336 (158/384).  Lorenzo Ebecilio (AFC Ajax)
143/336 (159/384).  Kolbeinn Sigthórsson (AFC Ajax)
144/336 (160/384).  Miralem Sulejmani (AFC Ajax)
145/336 (161/384).  Christian Abbiati (A.C. Milan)
146/336 (162/384).  Ignazio Abate (A.C. Milan)
147/336 (163/384).  Luca Antonini (A.C. Milan)
148/336 (164/384).  Alessandro Nesta (A.C. Milan)
149/336 (165/384).  Thiago Silva (A.C. Milan)
150/336 (166/384).  Mario Yepes (A.C. Milan)
151/336 (167/384).  Massimo Ambrosini (A.C. Milan)
152/336 (168/384).  Alberto Aquilani (A.C. Milan)
153/336 (169/384).  Kevin-Prince Boateng (A.C. Milan)
154/336 (170/384).  Antonio Nocerino (A.C. Milan)
155/336 (171/384).  Clarence Seedorf (A.C. Milan)
156/336 (172/384).  Mark van Bommel (A.C. Milan)
157/336 (173/384).  Zlatan Ibrahimović (A.C. Milan)
158/336 (174/384).  Maxi López (A.C. Milan)
159/336 (175/384).  Pato (A.C. Milan)
160/336 (176/384).  Robinho (A.C. Milan)
161/336 (177/384).  Maarten Stekelenburg (A.S. Roma)
162/336 (178/384).  José Ángel (A.S. Roma)
163/336 (179/384).  Gabriel Heinze (A.S. Roma)
164/336 (180/384).  Juan (A.S. Roma)
165/336 (181/384).  Simon Kjær (A.S. Roma)
166/336 (182/384).  Aleandro Rosi (A.S. Roma)
167/336 (183/384).  Rodrigo Taddei (A.S. Roma)
168/336 (184/384).  Daniele De Rossi (A.S. Roma)
169/336 (185/384).  Fernando Gago (A.S. Roma)
170/336 (186/384).  Simone Perrotta (A.S. Roma)
171/336 (187/384).  Miralem Pjanić (A.S. Roma)
172/336 (188/384).  Bojan Krkić (A.S. Roma)
173/336 (189/384).  Fabio Borini (A.S. Roma)
174/336 (190/384).  Erik Lamela (A.S. Roma)
175/336 (191/384).  Pablo Osvaldo (A.S. Roma)
176/336 (192/384).  Francesco Totti (A.S. Roma)
177/336 (193/384).  Julio Cesar (Internazionale Milan)
178/336 (194/384).  Lucio (Internazionale Milan)
179/336 (195/384).  Maicon (Internazionale Milan)
180/336 (196/384).  Yuto Nagatomo (Internazionale Milan)
181/336 (197/384).  Andrea Ranocchia (Internazionale Milan)
182/336 (198/384).  Walter Samuel (Internazionale Milan)
183/336 (199/384).  Javier Zanetti (Internazionale Milan)
184/336 (200/384).  Ricardo Álvarez (Internazionale Milan)
185/336 (201/384).  Esteban Cambiasso (Internazionale Milan)
186/336 (202/384).  Fredy Guarín (Internazionale Milan)
187/336 (203/384).  Joel Obi (Internazionale Milan)
188/336 (204/384).  Angelo Palombo (Internazionale Milan)
189/336 (205/384).  Wesley Sneijder (Internazionale Milan)
190/336 (206/384).  Diego Forlan (Internazionale Milan)
191/336 (207/384).  Diego Milito (Internazionale Milan)
192/336 (208/384).  Giampaolo Pazzini (Internazionale Milan)
193/336 (209/384).  Gianluigi Buffon (Juventus)
194/336 (210/384).  Andrea Barzagli (Juventus)
195/336 (211/384).  Leonardo Bonucci (Juventus)
196/336 (212/384).  Martín Cáceres (Juventus)
197/336 (213/384).  Giorgio Chiellini (Juventus)
198/336 (214/384).  Stephan Lichtsteiner (Juventus)
199/336 (215/384).  Emanuele Giaccherini (Juventus)
200/336 (216/384).  Milos Krasic (Juventus)
201/336 (217/384).  Claudio Marchisio (Juventus)
202/336 (218/384).  Simone Pepe (Juventus)
203/336 (219/384).  Andrea Pirlo (Juventus)
204/336 (220/384).  Arturo Vidal (Juventus)
205/336 (221/384).  Alessandro Del Piero (Juventus)
206/336 (222/384).  Alessandro Matri (Juventus)
207/336 (223/384).  Fabio Quagliarella (Juventus)
208/336 (224/384).  Mirko Vucinic (Juventus)
209/336 (225/384).  Federico Marchetti (S.S. Lazio)
210/336 (226/384).  André Dias (S.S. Lazio)
211/336 (227/384).  Giuseppe Biava (S.S. Lazio)
212/336 (228/384).  Modibo Diakite (S.S. Lazio)
213/336 (229/384).  Abdoulay Konko (S.S. Lazio)
214/336 (230/384).  Stefan Radu (S.S. Lazio)
215/336 (231/384).  Marius Stankevicius (S.S. Lazio)
216/336 (232/384).  Cristian Brocchi (S.S. Lazio)
217/336 (233/384).  Alvaro Gonzalez (S.S. Lazio)
218/336 (234/384).  Hernanes (S.S. Lazio)
219/336 (235/384).  Cristian Ledesma (S.S. Lazio)
220/336 (236/384).  Senad Lulic (S.S. Lazio)
221/336 (237/384).  Djibril Cissé (S.S. Lazio)
222/336 (238/384).  Miroslav Klose (S.S. Lazio)
223/336 (239/384).  Tommaso Rocchi (S.S. Lazio)
224/336 (240/384).  Giuseppe Sculli (S.S. Lazio)
225/336 (241/384).  Samir Handanovic (Udinese Calcio)
226/336 (242/384).  Pablo Armero (Udinese Calcio)
227/336 (243/384).  Dusan Basta (Udinese Calcio)
228/336 (244/384).  Medhi Benatia (Udinese Calcio)
229/336 (245/384).  Danilo (Udinese Calcio)
230/336 (246/384).  Maurizio Domizzi (Udinese Calcio)
231/336 (247/384).  Almen Abdi (Udinese Calcio)
232/336 (248/384).  Emmanuel Agyemang Badu (Udinese Calcio)
233/336 (249/384).  Kwadwo Asamoah (Udinese Calcio)
234/336 (250/384).  Mauricio Isla (Udinese Calcio)
235/336 (251/384).  Giampiero Pinzi (Udinese Calcio)
236/336 (252/384).  Paulo Vitor Barreto (Udinese Calcio)
237/336 (253/384).  Antonio Di Natale (Udinese Calcio)
238/336 (254/384).  Diego Fabbrini (Udinese Calcio)
239/336 (255/384).  Antonio Floro Flores (Udinese Calcio)
240/336 (256/384).  Gabriel Torje (Udinese Calcio)
241/336 (257/384).  Helton (F.C. Porto)
242/336 (258/384).  Maicon (F.C. Porto)
243/336 (259/384).  Nicolás Hernán Otamendi (F.C. Porto)
244/336 (260/384).  Álvaro Pereira (F.C. Porto)
245/336 (261/384).  Rolando (F.C. Porto)
246/336 (262/384).  Cristian Săpunaru (F.C. Porto)
247/336 (263/384).  Fernando Belluschi (F.C. Porto)
248/336 (264/384).  Steven Defour (F.C. Porto)
249/336 (265/384).  Fernando (F.C. Porto)
250/336 (266/384).  Lucho Gonzalez (F.C. Porto)
251/336 (267/384).  João Moutinho (F.C. Porto)
252/336 (268/384).  James Rodríguez (F.C. Porto)
253/336 (269/384).  Hulk (F.C. Porto)
254/336 (270/384).  Kléber (F.C. Porto)
255/336 (271/384).  Cristian Rodríguez (F.C. Porto)
256/336 (272/384).  Silvestre Varela (F.C. Porto)
257/336 (289/384).  Víctor Valdés (F.C. Barcelona)
258/336 (290/384).  Éric Abidal (F.C. Barcelona)
259/336 (291/384).  Adriano (F.C. Barcelona)
260/336 (292/384).  Daniel Alves (F.C. Barcelona)
261/336 (293/384).  Gerard Pique (F.C. Barcelona)
262/336 (294/384).  Carles Puyol (F.C. Barcelona)
263/336 (295/384).  Sergi Busquets (F.C. Barcelona)
264/336 (296/384).  Cesc Fabregas (F.C. Barcelona)
265/336 (297/384).  Andrés Iniesta (F.C. Barcelona)
266/336 (298/384).  Javier Mascherano (F.C. Barcelona)
267/336 (299/384).  Thiago Alcántara (F.C. Barcelona)
268/336 (300/384).  Xavi (F.C. Barcelona)
269/336 (301/384).  Lionel Messi (F.C. Barcelona)
270/336 (302/384).  Pedro (F.C. Barcelona)
271/336 (303/384).  Alexis Sánchez (F.C. Barcelona)
272/336 (304/384).  David Villa (F.C. Barcelona)
273/336 (305/384).  Iker Casillas (Real Madrid C.F.)
274/336 (306/384).  Alvaro Arbeloa (Real Madrid C.F.)
275/336 (307/384).  Fabio Coentrao (Real Madrid C.F.)
276/336 (308/384).  Marcelo (Real Madrid C.F.)
277/336 (309/384).  Pepe (Real Madrid C.F.)
278/336 (310/384).  Sergio Ramos (Real Madrid C.F.)
279/336 (311/384).  José María Callejón (Real Madrid C.F.)
280/336 (312/384).  Lassana Diarra (Real Madrid C.F.)
281/336 (313/384).  Ángel Di María (Real Madrid C.F.)
282/336 (314/384).  Kakà (Real Madrid C.F.)
283/336 (315/384).  Sami Khedira (Real Madrid C.F.)
284/336 (316/384).  Mesut Özil (Real Madrid C.F.)
285/336 (317/384).  Xabi Alonso (Real Madrid C.F.)
286/336 (318/384).  Karim Benzema (Real Madrid C.F.)
287/336 (319/384).  Cristiano Ronaldo (Real Madrid C.F.)
288/336 (320/384).  Gonzalo Higuaín (Real Madrid C.F.)
289/336 (321/384).  Javi Varas (Sevilla F.C.)
290/336 (322/384).  Coke (Sevilla F.C.)
291/336 (323/384).  Julien Escudé (Sevilla F.C.)
292/336 (324/384).  Fernando Navarro (Sevilla F.C.)
293/336 (325/384).  Emir Spahic (Sevilla F.C.)
294/336 (326/384).  Emiliano Armenteros (Sevilla F.C.)
295/336 (327/384).  José Campaña (Sevilla F.C.)
296/336 (328/384).  Jesús Navas (Sevilla F.C.)
297/336 (329/384).  Gary Medel (Sevilla F.C.)
298/336 (330/384).  Diego Perotti (Sevilla F.C.)
299/336 (331/384).  Ivan Rakitić (Sevilla F.C.)
300/336 (332/384).  José Antonio Reyes (Sevilla F.C.)
301/336 (333/384).  Piotr Trochowski (Sevilla F.C.)
302/336 (334/384).  Frédéric Kanouté (Sevilla F.C.)
303/336 (335/384).  Manu Del Moral (Sevilla F.C.)
304/336 (336/384).  Alvaro Negredo (Sevilla F.C.)
305/336 (337/384).  Diego Alves (Valencia C.F.)
306/336 (338/384).  Antonio Barragán (Valencia C.F.)
307/336 (339/384).  Jordi Alba (Valencia C.F.)
308/336 (340/384).  Jérémy Mathieu (Valencia C.F.)
309/336 (341/384).  Miguel (Valencia C.F.)
310/336 (342/384).  Adil Rami (Valencia C.F.)
311/336 (343/384).  Víctor Ruiz (Valencia C.F.)
312/336 (344/384).  David Albelda (Valencia C.F.)
313/336 (345/384).  Éver Banega (Valencia C.F.)
314/336 (346/384).  Sofiane Feghouli (Valencia C.F.)
315/336 (347/384).  Pablo Hernández (Valencia C.F.)
316/336 (348/384).  Tino Costa (Valencia C.F.)
317/336 (349/384).  Aritz Aduriz (Valencia C.F.)
318/336 (350/384).  Jonas (Valencia C.F.)
319/336 (351/384).  Pablo Piatti (Valencia C.F.)
320/336 (352/384).  Roberto Soldado (Valencia C.F.)
321/336 (353/384).  Diego López (Villarreal C.F.)
322/336 (354/384).  José Manuel Catalá (Villarreal C.F.)
323/336 (355/384).  Joan Oriol (Villarreal C.F.)
324/336 (356/384).  Carlos Marchena (Villarreal C.F.)
325/336 (357/384).  Mario Gaspar (Villarreal C.F.)
326/336 (358/384).  Mateo Musacchio (Villarreal C.F.)
327/336 (359/384).  Gonzalo Rodríguez (Villarreal C.F.)
328/336 (360/384).  Cristián Zapata (Villarreal C.F.)
329/336 (361/384).  Borja Valero (Villarreal C.F.)
330/336 (362/384).  Bruno Soriano (Villarreal C.F.)
331/336 (363/384).  Cani (Villarreal C.F.)
332/336 (364/384).  Jonathan De Guzmán (Villarreal C.F.)
333/336 (365/384).  Marcos Senna (Villarreal C.F.)
334/336 (366/384).  Nilmar (Villarreal C.F.)
335/336 (367/384).  Giuseppe Rossi (Villarreal C.F.)
336/336 (368/384).  Marco Ruben (Villarreal C.F.)

The following teams were removed from the Chinese edition (as compared to the original Japanese edition):

129-144.  Olympiakos FC
273-288.  Zenit St. Petersburg
369-384.  F.C. Shakhtar Donetsk