RT Journal Article SR Electronic T1 Prevention of malaria in travellers: a growing problem JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1037 OP 1038 VO 141 IS 10 A1 J. S. Keystone A1 J. D. MacLean YR 1989 UL http://www.cmaj.ca/content/141/10/1037.abstract