Institutional Review Board Statement
The protocol was conducted in accordance with the Declaration of Helsinki and approved by the local ethics committee (Ethics Committee of the Medical University Vienna, Vienna, Austria; Date of registration: 2014-09-03; registration number: EK Nr. 1571/2014, serial number 456499; investigator: Sabine Sator), as well as by the Austrian Federal Office for Safety in Health Care BASG (INS-621000-0687).