Nutritional risk and HbA1c as critical risk factors and predictors of opportunistic infections in HIV-DM comorbid patients: a retrospective cross-sectional study - Zhu, Qiong’e; Gao, Fengjiao; Ren, Xiaoxia; Li, Rui; Kang, Jun; Li, Maoquan; Liu, Dafeng (Frontiers in Endocrinology, 2025)