No author listed. Communicable Diseases Intelligence volume 15 issue 3 - 11 February 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1992 Feb. 11 [cited 2026 Apr. 15];15:35-56. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2907