[1] Univ Ulsan, Coll Med, Asan Med Ctr, Seoul, South Korea
[2] Kaohsiung Med Univ Hosp, Kaohsiung, Taiwan
[3] Yonsei Univ Hlth Syst, Severance Hosp, Seoul, South Korea
[4] China Med Univ Hosp, Taichung, Taiwan
[5] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Seoul, South Korea
[6] Chang Gung Mem Hosp Keelong, Gastroenterol, Keelung, Taiwan
[7] Taipei Vet Gen Hosp, Taipei, Taiwan
[8] Gilead Sci Inc, Foster City, CA 94404 USA
[9] Inje Univ, Pusan Paik Hosp, Busan, South Korea
[10] Natl Cheng Kung Univ Hosp, Tainan 70428, Taiwan
[11] Seoul Natl Univ, Bundang Hosp, Seoul, South Korea
[12] Natl Taiwan Univ Hosp, Taipei, Taiwan