1. A randomized clinical trial of alpha(1)-antitrypsin augmentation therapy;Dirksen;American Journal of Respiratory and Critical Care Medicine,1999
2. A randomized placebo-controlled trial of alpha1-antitrypsin augmentation therapy [abstract];Dirksen;European Respiratory Journal. Supplement,1998
3. Alpha-1-antitrypsin (AAT) to treat emphysema in AAT-deficient patients (EXACTLE) (trial registration) http://clinicaltrials.gov/ct2/show/NCT00263887?term=antitrypsin&rank=7
4. Exploring the role of CT densitometry: a randomised study of augmentation therapy inalpha-1 antitrypsin deficiency;Dirksen;European Respiratory Journal,2009
5. Dirksen A Piitulainen E Parr DG Deng C Wencker M Shaker SB Exploring the role of CT densitometry: a randomised study of augmentation therapy inalpha-1 antitrypsin deficiency http://erj.ersjournals.com/content/vol0/issue2009/images/data/09031936.00159408/DC1/Paper_1_ONLINE_SUPPLEMENT_ERJ__Oct_22_for_submission.doc (accessed 5 Jan 2010)