Adjuvant effects of vitamin A and vitamin D supplementation on treatment of children with attention-deficit/hyperactivity disorder: a study protocol for a randomised, double-blinde... by Bin Peng, Bin Liu, Ping Zhou, Qian Cheng, Ting Yang, Li Chen, Jie Chen, Yongfang Liu, Tingyu Li, Xiaoli Li, Mark Lee Wolraich, Ai-hua Cao, Fei-Yong Jia

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