title: The effect of multiple intramuscular placebo injections on injection-site tolerance and serum creatine phosphokinase activity.
mesh_terms: D000328:Adult; D003402:Creatine Kinase / Q000097:blood*; D006801:Humans; D007273:Injections, Intramuscular / Q000009:adverse effects*; D008297:Male; D010919:Placebos / Q000008:administration & dosage*; D013997:Time Factors
chemical_list: D010919:Placebos; D003402:Creatine Kinase