AWOL on health tests. Fewer volunteers makes research tougher.
Rubin
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D001241:Aspirin / Q000592:standards; D016026:Bone Marrow Transplantation / Q000592:standards; D002318:Cardiovascular Diseases / Q000517:prevention & control; D015914:Estrogen Replacement Therapy / Q000592:standards; D005260:Female; D006801:Humans; D010919:Placebos; D016032:Randomized Controlled Trials as Topic / Q000592:standards*; D012109:Research Support as Topic / Q000639:trends; D014481:United States; D016387:Women's Health