Text and Data Mining valid from 2019-11-18
Accepted: 12 October 2019
First Online: 18 November 2019
Compliance with ethical standards
: None of the authors have a conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Local Research Ethics Committees approvals were obtained from each of the 74 participating centres.
: Informed consent was obtained from all individual participants included in the study.