Fig. 1From: A systematic review and meta-analysis on sodium tanshinone IIA sulfonate injection for the adjunctive therapy of pulmonary heart diseasePRISMA flow diagram of study selection process. CNKI is China National Knowledge Infrastructure; VIP is Chinese Scientific Journal Database; WF is Wangfang Data; Other sources are Google Scholar, Medline, Sino-Med, Chinese Biomedical Literature Database, Chinese Science Citation Database, Cochrane Library and EmbaseBack to article page