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Andreja Vujanac, Vladimir Jakovljevic, Dusica Djordjevic, Vladimir Zivkovic, Mirjana Stojkovic, Dragan Celikovic, Nebojsa Andjelkovic, Aleksandra Jurisic Skevin, Dragan Djuric 
World J Gastroenterol 18(4):331-339. Published online Jan 28, 2012. doi: 10.3748/wjg.v18.i4.331
Toshiya Kamiyama, Masato Takahashi, Kazuaki Nakanishi, Hideki Yokoo, Hirofumi Kamachi, Nozomi Kobayashi, Michitaka Ozaki, Satoru Todo 
World J Gastroenterol 18(4):340-348. Published online Jan 28, 2012. doi: 10.3748/wjg.v18.i4.340
Lin Zhao, Wen-Qiang Wei, De-Li Zhao, Chang-Qing Hao, Dong-Mei Lin, Qin-Jing Pan, Xin-Qing Li, Fu-Hua Lei, Jin-Wu Wang, Guo-Qing Wang, Qi Shang, You-Lin Qiao 
World J Gastroenterol 18(4):375-382. Published online Jan 28, 2012. doi: 10.3748/wjg.v18.i4.375