More Groups
Fewer Groups
More People
Fewer People
Schrag, D.; Kuntz, K. M.; Garber, J. E.; Weeks, J. C. JAMA - Journal of the American Medical Association (2000)
Schrag, D.; Cramer, L. D.; Bach, P. B.; Cohen, A. M.; Warren, J. L.; Begg, C. B. JAMA - Journal of the American Medical Association (2000)
Breitbart, W.; Rosenfeld, B.; Pessin, H.; Kaim, M.; Funesti-Esch, J.; Galietta, M.; Nelson, C. J.; Brescia, R. JAMA - Journal of the American Medical Association (2000)
Altman, J. F.; Oliveria, S. A.; Christos, P. J.; Halpern, A. C. Archives of Family Medicine (2000)