Understanding power calculations in clinical trials.
Prince
Richard L
RL
Zhu
Kun
K
Lewis
Joshua R
JR
D002136:Calcium, Dietary / Q000494:pharmacology; D002986:Clinical Trials as Topic / Q000379:methods*; D005260:Female; D050723:Fractures, Bone / Q000473:pathology; D006801:Humans; D055118:Medication Adherence; D010919:Placebos; D018401:Sample Size; D014807:Vitamin D / Q000494:pharmacology
D002136:Calcium, Dietary; D010919:Placebos; D014807:Vitamin D