Randomized, double-blind, placebo-controlled trial of vitamin D supplementation in Parkinson disease.
Am J Clin Nutr. 2013 May;97(5):1004-13. doi: 10.3945/ajcn.112.051664. Epub 2013 Mar 13.
Am J Clin Nutr. 2013.
PMID: 23485413
Clinical Trial.