1. To a man with a hammer, everything looks like a nail;Robertson, I.;BMJ,1993
2. To a man with a hammer, everything looks like a nail;Robertson, I.;BMJ,1993
3. To a man with a hammer, everything looks like a nail;Robertson, I.;BMJ,1993
4. British Thoracic Society. Guidelines for the management of asthma: a summary;BMJ,1993
5. British Thoracic Society. Guidelines on the management of asthma