No author listed. Communicable Diseases Intelligence volume 15 issue 22 - 4 November 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Nov. 4 [cited 2026 Apr. 10];15:399-416. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2930