Competing interests: JA was a clinical investigator in the study of photodynamic treatment using verteporfin, which was funded by CIBA Vision/QLT. She has been supported by CIBA Vision for attendance at conferences and symposia. If you are interested in being a contributor or peer reviewer for Clinical Evidence please visit the Clinical Evidence website (www.clinicalevidence.org) Clinical Evidence is published by BMJ Publishing Group. The third issue is available now, and Clinical Evidence will be updated and expanded every six months. Individual subscription rate, issues 3 and 4 £75/$140; institutional rate £160/$245. For more information including how to subscribe, please visit the Clinical Evidence website at www.clinicalevidence.org
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Jennifer Arnold (2000) studied this question.
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