[1] Univ Philadelphia, Philadelphia, PA USA
[2] Med Prod Agcy, Uppsala, Sweden
[3] Univ Hosp Maastricht, Maastricht, Netherlands
[4] Univ Uppsala Hosp, Uppsala, Sweden
[5] Dutch Inst Healthcare Improvement, Utrecht, Netherlands
[6] Univ Pittsburgh, Pittsburgh, PA 15260 USA
[7] Sahlgrens Univ Hosp, S-41345 Gothenburg, Sweden
[8] Bristol Urol Inst, Bristol, Avon, England