PT - JOURNAL ARTICLE AU - L.M. Spencer AU - J.A. Alison AU - Z.J. McKeough TI - Maintaining benefits following pulmonary rehabilitation: a randomised controlled trial AID - 10.1183/09031936.00073609 DP - 2009 Jul 30 TA - European Respiratory Journal 4099 - http://erj.ersjournals.com/content/early/2009/07/30/09031936.00073609.short 4100 - http://erj.ersjournals.com/content/early/2009/07/30/09031936.00073609.full