No author listed. Communicable Diseases Intelligence volume 15 issue 16 - 12 August 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Aug. 12 [cited 2026 Apr. 12];15:263-82. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2924