Zhou N, Yu Q, Li X, Yu Y, Kou C, Li W, Xu H, Luo X, Zuo L, Kosten TR, Zhang XY. Association of the dopamine β-hydroxylase 19 bp insertion/deletion polymorphism with positive symptoms but not tardive dyskinesia in schizophrenia. Hum Psychopharmacol. 2013 May;28(3):230–7. doi: 10.1002/hup.2311. PMID: 23559427.