Hiroshi Ohmae, Manami Tanaka, Masataka Hayashi, Yasushi Matsuzaki, Yoshihisa Kurosaki, Bayani L. Blas, Gerundio G. Portillo, Orland S. Sy, Yuji Irie and Kazuo Yasuraoka(1992) : Ultrasonographic and serologic abnormalities in Schistosoma japonicum infection in Leyte, the Philippines, Am. J. Trop. Med. Hyg.46:89−98