Authors: Marc Arbyn; Andrew Bryant; Philippe Beutels; Pierre Pl Martin-Hirsch; Evangelos Paraskevaidis; Elke Van Hoof; Marc Steben; Youlin Qiao; Fang-Hui Zhao; Achim Schneider; Andreas Kaufmann; Joakim Dillner; Lauri Markowitz; Allan Hildesheim Journal: Cochrane Database Syst Rev Date: 2011