No author listed. Communicable Diseases Intelligence volume 15 issue 23 - 18 November 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Nov. 18 [cited 2026 Apr. 11];15:419-38. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2931