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Article History

Received: 5 April 2019

Revised: 8 August 2019

Accepted: 8 August 2019

First Online: 2 September 2019

Competing interests

: The authors declare no competing interests.

: This study was approved by the Danish Data Protection Agency. No ethics committee approval is required for register-based studies in Denmark.

: This study was supported by the Danish Cancer Society, “Agnes og Poul Friis Fond”, “Grosserer A.V. Lykfeldt og hustrus Legat”, “Grosserer M. Brogaard og hustrus Mindefond”, “Knud og Edith Eriksens Mindefond” and “Købmand Sven Hansen og Hustru Ina Hansens Fond”.

: The data underlying this paper cannot be shared without violation of Danish law. Researchers can obtain data themselves by applying at (Danish Health Data Authority).