No author listed. Communicable Diseases Intelligence volume 15 issue 6 - 25 March 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Mar. 25 [cited 2026 Apr. 7];15:92-113. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2911