Acknowledgements
We thank all patients for their valuable contribution by participating in this study; the study nurses Martina Maria Wiegert and Daniela Silvia Minio for their support in patient follow-up; Nicole Bruni for programming and data management; Marina Maurer for administrative support; Mirjam Stranzl for data monitoring; Melina Verbeek and Andreas Haenny for data cleaning and database entries; Dominik Stämpfli for performing study visits.