A preliminary investigation of amino acid and acylcarnitine levels in neonates from the Tibet autonomous oleh Chunyan Zhang, Drun Dha, Yuxuan Cheng, Ya Ma, Yan Meng, Drun Tse, Dolma Ngawang, Pedrun Dekyi, Tao Jiang, Yang Shu, Jiayi Cui, Jing Li, Yaping Tian