More Groups
Fewer Groups
Zimbalist, E.; Lightdale, C. J.; Winawer, S. J.; Ritchie, M.; Kelsen, D.; Bains, M. Gastrointestinal Endoscopy (1986)
Markman, M. Current Problems in Cancer (1986)
Girasek, D. C. Journal of the American Academy of Dermatology (1986)