Identification of novel susceptibility loci for inflammatory bowel disease on chromosomes 1p, 3q, and 4q: evidence for epistasis between 1p and IBD1. - Cho JH; Nicolae DL; Gold LH; Fields CT; LaBuda MC; Rohal PM; Pickles MR; Qin L; Fu Y; Mann JS; Kirschner BS; Jabs EW; et al. (Proceedings of the National Academy of Sciences of the United States of America, 1998)