1998c-194 africa anthropology betsileo(malagasypeople) betsileo(peupledemadagascar) deliveryofhealthcare gezondheid gn296u551998 healthandhygiene medicalanthropology medicalsociology medicine medischeantropologie methodology milieuaantasting médecine médecinetraditionnelle méthodologie philosophie philosophy publichealth regenwouden santéethygiène socialchange socialmedicine tanala(malagasypeople) tanala(peupledemadagascar) traditionalmedicine tribalegroepen