Letter: C-Film as a contraceptive.
D002986:Clinical Trials as Topic; D003270:Contraceptive Agents; D004338:Drug Combinations; D006801:Humans; D011092:Polyethylene Glycols / Q000008:administration & dosage*; D011143:Polyvinyl Chloride / Q000008:administration & dosage*; D011145:Polyvinyls / Q000008:administration & dosage*
D003270:Contraceptive Agents; D004338:Drug Combinations; D011145:Polyvinyls; D011092:Polyethylene Glycols; D011143:Polyvinyl Chloride