1. Analysis Group, Inc, Boston, MA, USA
2. Janssen Pharmaceutica NV, Beerse, Belgium
3. Janssen-Cilag, Warsaw, Poland
4. Janssen-Cilag Ltd, High Wycombe, Buckinghamshire, UK
5. Janssen-Cilag GmbH, Neuss, Germany
6. Center for Translational Research in Inflammatory Skin Diseases, Institute for Health Services Research in Dermatology and Nursing, University Medical Center Hamburg-Eppendorf, Hamburg, Germany