Placebo effect in primary insomnia: a meta-analysis
PAN Sheng-ke, LI Hui, WEI Yan-yan, YAO Pei-fen, LI Hua-fang
上海交通大学学报（医学版） . 2020, (4): 505 .  DOI: 10.3969/j.issn.1674-8115.2020.04.015