TY - T1的研究设计的不良事件asthma treatment JF - European Respiratory Journal JO - Eur Respir J SP - 773 LP - 775 VL - 5 IS - 7 AU - Ernst, P AU - Suissa, S Y1 - 1992/07/01 UR - //www.qdcxjkg.com/content/5/7/773.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -