Stifft, Frank http://orcid.org/0000-0002-1962-1929
Vandermeer, Franciscus
Neef, Cees
van Kuijk, Sander http://orcid.org/0000-0003-2796-729X
Christiaans, Maarten H. L.
Article History
Received: 18 February 2019
Accepted: 5 December 2019
First Online: 4 February 2020
Compliance with ethical standards
:
: All main studies cited above were conducted in accordance with the Declaration of Helsinki. The protocols had been reviewed by the Ethics Committee at each study centre and each patient had given written informed consent prior to enrolment into the study. The main studies were conducted between 2003 and 2004 [CitationRef removed, CitationRef removed], i.e. before the cut-off date for registration of new and ongoing clinical trials and, thus, were not registered in a public trials registry. Collection, storage, and use of patient data were performed in agreement with FEDERA (Federation of Dutch University Medical Centers) Code of Conduct (www.nfu.nl).
: The authors declare that they have no conflicts of interest.