Abstract
Footnotes Competing interests WMcN has been reimbursed by Glaxo-SmithKline, and Boehringer-Ingelheim for attending several conferences. He has been paid for speaking at medical conferences organised by GlaxoSmithKline, AstraZeneca, Boehringer-Ingelheim, and Zambon. He has received funding for research from Pfizer, GlaxosmithKline, and SMB Pharmaceuticals but not directly related to any of the drugs discussed in the article.