No author listed. Communicable Diseases Intelligence volume 15 issue 5 - 11 March 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Mar. 11 [cited 2026 Apr. 5];15:71-88. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2909