title: [Twin cases with methylmalonic aciduria and homocysteinemia].
authors: Hu
authors: H
authors: Hao
authors: Yuan-Zong
authors: YZ
authors: Song
authors: Xin
authors: X
authors: Xiao
mesh_terms: D000592:Amino Acid Metabolism, Inborn Errors / Q000473:pathology*; D002675:Child, Preschool; D006801:Humans; D008297:Male; D014427:Twins