1. British guideline on the management of asthma;British Thoracic Society, Scottish Intercollegiate Guidelines Network;Thorax,2003
2. BTS guidelines for the management of chronic obstructive pulmonary disease;Thorax,1997
3. Inhaler technique in the elderly;Armitage;Age Ageing,1988
4. A comparison of breath-actuated and conventional metered-dose inhaler inhalation techniques in elderly subjects;Chapman;Chest.,1993
5. Problems elderly patients have using metered dose inhalers;Elizabeth;Geriatr Med.,1988