[1] Univ Penn, Childrens Hosp Philadelphia, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Childrens Hosp Philadelphia, Div Pediat Gastroenterol Hepatol & Nutr, Philadelphia, PA 19104 USA
[3] Univ Penn, Childrens Hosp Philadelphia, Dept Pediat, Div Genet, Philadelphia, PA 19104 USA
[4] Univ Penn, Perelman Sch Med, Genom & Computat Biol Grad Grp, Philadelphia, PA 19104 USA
[5] Univ Penn, Perelman Sch Med, Dept Orthopaed Surg, Philadelphia, PA 19104 USA
[6] Univ Penn, Perelman Sch Med, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[7] Univ Michigan, Dept Neurol, Ann Arbor, MI USA
[8] Univ Michigan, Dept Physiol, Ann Arbor, MI 48109 USA
[9] Univ Michigan, Med Scientist Training Program, Ann Arbor, MI 48109 USA
[10] VA Ann Arbor Healthcare Syst, Ann Arbor, MI USA
[11] Michigan State Univ, Dept Physiol, Dept Small Anim Clin Sci, Coll Nat Sci, E Lansing, MI 48824 USA
[12] Michigan State Univ, Dept Physiol, Dept Small Anim Clin Sci, Coll Osteopath Med, E Lansing, MI 48824 USA
[13] Michigan State Univ, Dept Physiol, Dept Small Anim Clin Sci, Coll Vet Med, E Lansing, MI 48824 USA
[14] Univ Toronto, Hosp Sick Children, Div Gastroenterol Hepatol & Nutr, Toronto, ON, Canada
[15] Univ Roma La Sapienza, Dept Mol Med, Rome, Italy