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Letters must be no longer than 400 words and must include a word count. All lette rs are subject to editing. Proofs will not nonmally be supplied. There should be no more than 4 au thors per letter. Each author should provide current qualifications and position. Contact telephone and facsimile numbers should be supplied. Letters from a alngle author may be submitted bye-mall (ampcoOampco.com.au). but must include full details of postal address and telephone number. There should be no more than 5 references. The reference list shou ld not Include anything that has not been published or accepted for publication. Reference details must be complete, Including: names and initials for up to 4 authors, or 3 authors , et al. il there are more than 4; places and dates for conferences and publishers, places and year of publication for their proceedings; publishers, places. year of publication and page numbers for monographs ; volume numbers and page numbers for journal articles. Hyperbaric oxygen for carbon monoxide poisoning