[1] Univ Calif Los Angeles, Los Angeles Cty Harbor Med Ctr, Div Med Genet, Torrance, CA 90502 USA
[2] Univ Calif Los Angeles, Los Angeles Cty Harbor Med Ctr, Dept Pediat, Torrance, CA 90509 USA
[3] Univ So Calif, Dept Prevent Med, Keck Sch Med, Los Angeles, CA 90089 USA
[4] Univ So Calif, USC Norris Comprehens Canc Ctr, Keck Sch Med, Los Angeles, CA 90089 USA
[5] Kaiser Permanente, Dept Gastroenterol, Los Angeles, CA USA
[6] Kaiser Permanente, Dept Gastroenterol, Bellflower, CA USA