Jemmott JB, III and Magloire K: Academic stress, social support, and secretory immunoglobulin A. J. Pers. Soc. Psychol., 55: 803-810, 1988
Yang R, Yehuda R, Holland D, et al.: Relationship between 3-methoxy-4-hydroxyphenylgllycol and homovanillic acid in saliva and plasma of healthy volunteers. Biol. Psychiatry, 42: 821-826, 1997