Observational studies of drug safety.
Walker
A M
AM
Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA.
Stampfer
M J
MJ
D002121:Calcium Channel Blockers / Q000009:adverse effects*; D004341:Drug Evaluation / Q000379:methods*; D006801:Humans; D009369:Neoplasms / Q000139:chemically induced*
D002121:Calcium Channel Blockers