title: Abstracts from japanese journal of hygiene(Nihon Eiseigaku Zasshi) vol. 52 no.3.
authors: Department of Hygiene, Showa University School of Medicine, Tokyo.
authors: S
authors: S
authors: Koike
authors: K
authors: K
authors: Murata
authors: R
authors: R
authors: Inaba
authors: H
authors: H
authors: Iwata
authors: T
authors: T
authors: Yokozeki
authors: J
authors: J
authors: Watanabe
authors: M
authors: M
authors: Makita
authors: S
authors: S
authors: Hasumura
authors: M
authors: M
authors: Hamano
authors: J
authors: J
authors: Fujinami