1. The Queen Elizabeth Hospital; Deptartment of Medicine; Woodville Road Adelaide South Australia Australia 5011
2. University of Auckland; Department of Medicine; Private Bag 92019 Auckland New Zealand
3. The Queen Elizabeth Hospital; Department of Medicine, University of Adelaide; Adelaide South Australia Australia 5011
4. The Queen Elizabeth Hospital; Respiratory Medicine; Adelaide South Australia Australia
5. The Cochrane Collaboration; Cochrane Editorial Unit; 13 Cavendish Square London UK W1G 0AN
6. The Crown Princess Mary Cancer Centre Westmead, Westmead Hospital; Medical Oncology; Westmead New South Wales Australia 2145
7. St George's, University of London; Population Health Sciences and Education; Cranmer Terrace London UK SW17 0RE