B A Baldo1, N J McDonnell2. 1. Retired. Formerly, Head, Molecular Immunology Unit, Kolling Institute of Medical Research, Royal North Shore Hospital of Sydney and Department of Medicine, University of Sydney, Sydney, NSW, Australia. Electronic address: babaldo@iinet.net.au. 2. Department of Anaesthesia and Pain Medicine, King Edward Memorial Hospital for Women and School of Women's and Infants' Health and School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia.