Patients with first-episode psychosis in northern Taiwan: neurocognitive performance and niacin response profile in comparison with schizophrenia patients of different familial loadings and relationship with clinical features.

"Declarations Ethics approval and consent to participateThis study was approved by the Research Ethics Committee of each participating hospital (National Taiwan University Hospital: 20150203RINC; Taipei City Hospital: TCHIRB-10501107; and Taoyuan Psychiatric Center: B20151222). For participants aged < 20 years, both the participant and one parent/legal guardian provided written informed consent after a complete description of the study; otherwise, only the participant provided the written informed consent. Consent for publicationNot applicable. Competing interestsAll authors declare that they have no conflicts of interest. Competing interests All authors declare that they have no conflicts of interest."

"Funding This study was supported by the Taiwan Ministry of Science and Technology (MOST 104-2314-B-002-070-MY3, 107-2314-B-002-214-MY3, and 109-2314-B-002-172-MY3) and the National Health Research Institute (09A1-SP07 and 10A1-SP02). The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies."