Association of plasma free-3-methoxy-4-hydroxy-phenyl (ethylene) glycol, natural killer cell activity, and delirium in post-operative patients - Nakamura,J.; Yoshimura,R.; Okuno,T.; Ueda,N.; Hachida,M.; Yasumoto,K.; Egami,H.; Maeda,H.; Nishi,M.; Aoyagi,S. (Int Clin Psychophramacol, 2000)