By Various Authors
By Unidentified Author
By M. Assar
By Edmund G Wagner, J N Lanoix
By World Health Organization(WHO)
By Earnest F Gloyna
By Rajagopalan, S., Shiffman, M.A.
By World Health Organization(WHO), Dyck, E.Van
By Barton, E., McMahon, R., Piot, M.
By Crompton, D.W.T., Montresor, A., Nesheim, Malden C., Savioli, L.
By World Health Organization
By N/A
By Mackay, Judith, Eriksen, Michael P
By Faich, G.A., Castle, W.M., Council for International Organizations of Medical Sciences