TY - JOUR AU - Li, Xiaoyan AU - He, Jie AU - Yu, Mi AU - Sun, Jian PY - 2020 TI - The efficacy of vitamin D therapy for patients with COPD: a meta-analysis of randomized controlled trials JF - Annals of Palliative Medicine; Vol 9, No 2 (March 31, 2020): Annals of Palliative Medicine Y2 - 2020 KW - N2 - UR - https://apm.amegroups.org/article/view/37487