Watanabe Y, Fukui N, Muratake T, Amagane H, Kaneko N, Nunokawa A, Someya T. Association study of a functional promoter polymorphism of the X-box binding protein 1 gene in Japanese patients with schizophrenia. Psychiatry Clin Neurosci. 2006 Oct;60(5):633–5. doi: 10.1111/j.1440-1819.2006.01570.x. PMID: 16958950.