Received: 26 January 2021
Accepted: 28 May 2021
First Online: 16 July 2021
: The study was performed as a retrospective administrative registry study, where all data were anonymised before use. All data used for this study are held by Statistics Denmark, which also has the administrative rights to the data and encrypts the identification number likewise in all datasets. In retrospective register studies in Denmark, ethics approval and individual consent is not required and all methods were performed in accordance with the relevant guidelines and regulations [CitationRef removed]. The data handling and storage in the project has been approved by the Danish Data Protection Agency (approval number 2007–58-015/GEH-2014-018 I-Suite number 02736).
: Not applicable.
: SCH has nothing to declare.NEB has nothing to declare.LØ has nothing to declare.MA has nothing to declare.EF has nothing to declare.JB has nothing to declare.LBO has nothing to declare.TKL has nothing to declare.GG has nothing to declare.CTP has nothing to declare.AD reports grants from The Lundbeck Foundation and the European Society of Cardiology unrelated to this study.