[1] Univ Maryland Baltimore, Program Genet & Genom Med, Baltimore, MD USA
[2] Duke Univ, Duke Clin Res Inst, Durham, NC USA
[3] Duke Univ, Div Gastroenterol, Durham, NC USA
[4] Univ N Carolina, Chapel Hill, NC USA
[5] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Boston, MA 02215 USA
[6] Duke Univ, Ctr Human Genome Variat, Inst Genome Sci & Policy, Durham, NC USA