No author listed. Communicable Diseases Intelligence volume 15 issue 24 - 2 December 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Dec. 2 [cited 2026 Apr. 24];15:439-62. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2932