No author listed. Communicable Diseases Intelligence volume 15 issue 25 - 16 December 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Dec. 16 [cited 2026 Apr. 22];15:463-86. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2933