AN IN VITRO INVESTIGATION ON THE INHIBITORY EFFECTS OF FOUR DIFFERENT SPECIES OF VINCA EXTRACTS ON LEISHMANIA MAJOR - M.Assmar,; S. Mehrabian,; N. Piazak,; M. Farahmand,; A. Majd,; S. Agah,; N. Seyed Safikhan,; M. Modabber,; S. Moslehi Jenabian, (Iranian Journal of Public Health)