Development and Spatial External Validation of a Predictive Model of Survival Based on Random Survival Forest Analysis for People Living With HIV and AIDS After Highly Active Antiretroviral Therapy in China: Retrospective Cohort Study - Xiaoshan Li; Yanhui Li; Zhengping Zhu; Bingxin Tan; Xiaoyi Zhou; Hongjie Shi; Xin Li; Ping Zhu; Yuanyuan Xu (Journal of Medical Internet Research)