1Department of Parasitology, Hanyang University College of Medicine, Seoul 133-791, Korea.
2Korea Association of Health Promotion, Seoul 157-704, Korea.
3Department of Parasitology, Faculty of Medical Sciences, National University of Laos, Vientiane, Lao PDR. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/