Effectiveness of app-based cognitive behavioral therapy for insomnia on preventing major depressive disorder in youth with insomnia and subclinical depression: A randomized clinical trial - Si-Jing Chen; Jian-Yu Que; Ngan Yin Chan; Le Shi; Shirley Xin Li; Joey Wing Yan Chan; Weizhen Huang; Chris Xie Chen; Chi Ching Tsang; Yuen Lam Ho; Charles M. Morin; Ji-Hui Zhang; et al. (PLoS Medicine)