Text and Data Mining valid from 2019-05-23
Received: 13 August 2018
Accepted: 13 May 2019
First Online: 23 May 2019
: CR is a specialist in cardiology at the Medical University of Vienna. RB is a specialist in cardiology at the Hospital of St. John of God in Eisenstadt. MK is a research group leader at the Wittgenstein Centre (IIASA, OEAW/VID, WU) and Vienna Institute of Demography.
: This study is approved by the ethics committee of the Medical University of Vienna (EK Nr. 972/2011) and is also in line with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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