Decreased plasma tryptophan associated with deep white matter lesions in elderly subjects
H Yao, T Yuzuriha, H Koga, K Fukuda, K Endo, T Matsumoto, A Kato, A Uchino, T Ezaki, S Ibayashi, H Uchimura, M Fujishima
Journal of Neurology, Neurosurgery & Psychiatry Jan 1999, 66 (1) 100-103; DOI: 10.1136/jnnp.66.1.100