Effects of egg yolk choline intake on cognitive functions and plasma choline levels in healthy middle-aged and older Japanese: a randomized double-blinded placebo-controlled parall... oleh Soyogu Yamashita, Naoki Kawada, Wei Wang, Kenta Susaki, Yumi Takeda, Mamoru Kimura, Yoshitaka Iwama, Yutaka Miura, Michihiro Sugano, Ryosuke Matsuoka