More Groups
Fewer Groups
More People
Fewer People
Berwick, M.; Begg, C.; Mahabir, S.; Coit, D.; Brady, M. S.; Myskowski, P.; Roy, P.; Song, Y.; Canchola, R.; Orlow, I. American Journal of Epidemiology (2001)
Zhang, Z. F.; Sarkis, A. S.; Dalbagni, G.; Cordon-Cardo, C.; Reuter, V. E.; Pollack, D.; Sheinfeld, J.; Fair, W. R.; Begg, C. American Journal of Epidemiology (1993)