Kim JS, Jang SK, Park SC, Yi JS, Park JK, Lee JS, Choi KH, Lee SH. Measuring negative symptoms in patients with schizophrenia: reliability and validity of the Korean version of the Motivation and Pleasure Scale-Self-Report. Neuropsychiatr Dis Treat. 2016 May 11;12:1167-72. doi: 10.2147/NDT.S107775. eCollection 2016. PubMed PMID: 27274251; PubMed Central PMCID: PMC4869782.