More Groups
Fewer Groups
More People
Fewer People
Zelefsky, M. J.; Scher, H. I.; Krol, G.; Portenoy, R. K.; Leibel, S. A.; Fuks, Z. Y. Cancer (1992)
Wong, M. C.; Krol, G.; Rosenblum, M. K. Annals of Neurology (1992)