[1] Childrens Hosp Philadelphia, Div Gastroenterol Hepatol & Nutr, Dept Pediat, Philadelphia, PA 19104 USA
[2] Hepatitis B Fdn, Doylestown, PA USA
[3] Childrens Hosp, Div Gastroenterol, Boston, MA 02115 USA
[4] Baylor Coll Med, Dept Pediat Gastroenterol Hepatol & Nutr, Houston, TX 77030 USA
[5] Fox Chase Canc Ctr, Philadelphia, PA 19111 USA
[6] Alaska Native Tribal Hlth Consortium, Liver Dis & Hepatitis Program, Alaska Native Med Ctr, Anchorage, AK USA
[7] Seattle Childrens, Div Gastroenterol Hepatol & Nutr, Seattle, WA USA
[8] Univ Washington, Sch Med, Seattle, WA USA
[9] Univ Colorado, Dept Pediat, Sect Pediat Gastroenterol Hepatol & Nutr, Denver Sch Med, Aurora, CO USA
[10] Univ Colorado, Dept Pediat, Pediat Liver Ctr, Denver Sch Med, Aurora, CO USA
[11] Childrens Hosp, Aurora, CO USA
[12] Univ Calif San Francisco, San Francisco, CA 94143 USA
[13] Johns Hopkins Univ, Sch Med, Dept Pediat, Div Pediat Gastroenterol & Nutr,Pediat Liver Ctr, Baltimore, MD 21205 USA