[1] Quest Clin Res, San Francisco, CA USA
[2] Alamo Med Res Ltd, San Antonio, TX USA
[3] Fdn Invest Diego, Santurce, PR, Brazil
[4] GI Specialists Georgia, Marietta, GA USA
[5] Kansas City Gastroenterol & Hepatol LLCG, Kansas City, KS USA
[6] Univ Florida, Gainesville, FL USA
[7] Univ Calif San Diego, Coronado, CA USA
[8] Pharmasset Inc, Princeton, NJ USA