More Groups
Fewer Groups
More People
Fewer People
Markowitz, A. J.; Zauber, A.; Breite, I.; Gerdes, H.; Shike, M.; Kurtz, R. C.; Guillem, J.; Cohen, A.; Offit, K.; Taylor, F.; more... Gastroenterology (1996)
Wu, D.; Begg, C.; Houston, C.; Miller, E. Controlled Clinical Trials (1992)