- Dr A-L Ponsonby, Academic Unit of General Practice, Canberra Clinical School, Calvary Hospital, PO Box 254, Jamison Centre 2614, Australia
- Received September 14, 1998
- Revision requested November 25, 1998
- Revised April 20, 1999
- Accepted April 26, 1999
- First published August 1, 1999.
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