by Ricci, D A, Saltzman, M B, Meyer, C, Callachan, C, McCallum, R W
Published in Journal of clinical gastroenterology (01.02.1985)

by McCallum, R W, Fink, S M, Winnan, G R, Avella, J, Callachan, C
Published in The American journal of gastroenterology (01.03.1984)

by McCallum, R W, Holloway, R H, Callachan, C, Avella, J, Walsh, J H
Published in The American journal of gastroenterology (01.07.1983)