Adjunctive sapropterin dihydrochloride treatment in schizophrenia: A positive proof-of-concept, rater-blind, randomized, multivitamin-controlled study.

Competing Interests: Declaration of competing interest Dr. Catherine L. Clelland (CLC) and Dr. James D. Clelland (JDC) are inventors on a patent that is based in part upon this study data. CLC and JDC may benefit financially in the future if the patent is licensed. CLC and JDC declare no other financial relationships that are directly or indirectly related to this work. The remaining authors (Dr. Kantrowitz, Dr. Choo and Dr. Lieberman) declare no conflict of interest.