Buttenschøn HN, Jacobsen IS, Grynderup MB, Hansen AM, Kolstad HA, Kaerlev L, Thomsen JF, Nordentoft M, Silahtaroglu A, Tommerup N, Tümer Z, Krogh J, Børglum AD, Mors O. An association study between the norepinephrine transporter gene and depression. Psychiatr Genet. 2013 Oct;23(5):217–21. doi: 10.1097/ypg.0000000000000003. PMID: 23969988.