RolipramCyclic Nucleotide Phosphodiesterases, Type 4Phosphodiesterase InhibitorsPyrrolidinones3',5'-Cyclic-AMP PhosphodiesterasesResearchResearch Support as TopicCyclic Nucleotide Phosphodiesterases, Type 3PurinonesResearch DesignEthics, ResearchResearch PersonnelCyclic AMP4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneNursing ResearchCyclic Nucleotide Phosphodiesterases, Type 1Health Services ResearchTranslational Medical ResearchPhosphoric Diester HydrolasesGenetic ResearchPyridazinesClinical Nursing Research1-Methyl-3-isobutylxanthine