Letter: Caffeine, theophylline and human sperm motility.
D002110:Caffeine / Q000494:pharmacology*; D002478:Cells, Cultured; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D013081:Sperm Motility / Q000187:drug effects*; D013806:Theophylline / Q000494:pharmacology*
D002110:Caffeine; D013806:Theophylline