Circadian rhythms of melatonin and its relationship with anhedonia in patients with mood disorders: a cross-sectional study. - Li, Xinyu; Yu, Jiakuai; Jiang, Shuo; Fang, Liang; Li, Yifei; Ma, Shuangshuang; Kong, Hui; Qin, Ximing; Zhu, Daomin (BMC Psychiatry, 2024)