1. Cochrane Austria, Danube University Krems, Krems an der Donau, Austria, and RTI International, Research Triangle Park, North Carolina (G.G.)
2. Cochrane Austria, Danube University Krems, Krems an der Donau, Austria (G.W., L.A., A.C., A.D., I.K., A.K.)
3. Medical University of Vienna and Wilhelminen Hospital, Vienna, Austria (A.O.S.).