[1] Ohio State Univ, Med Ctr, Sect Intestinal Neoplasia & Hereditary Polyposis, Dept Gastroenterol Hepatol & Nutr, Columbus, OH 43210 USA
[2] Ohio State Univ, Med Ctr, Dept Gastroenterol Hepatol & Nutr, Columbus, OH 43210 USA
[3] Ohio State Univ, Coll Publ Hlth, Div Biostat, Columbus, OH 43210 USA