The effect of prohibiting outside food during COVID-19 pandemic on the body weight of schizophrenic patients taking olanzapine or clozapine: a retrospective self-controlled study - Zhang, Chengfang; Wang, Xiaodan; Hu, Chengping; Ding, Wenhua; Li, Han; Wu, Meng; Hu, Manji; Wang, Qiang; Sun, Xirong (Annals of Palliative Medicine, 2021)