title: Re: Experimental design to study sustained-release theophylline preparations.
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods; D003692:Delayed-Action Preparations; D006801:Humans; D012107:Research Design; D013806:Theophylline / Q000008:administration & dosage*
chemical_list: D003692:Delayed-Action Preparations; D013806:Theophylline