No author listed. Communicable Diseases Intelligence volume 15 issue 13 - 24 June 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Jun. 24 [cited 2026 Apr. 4];15:207-24. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2920