Text and Data Mining valid from 2018-04-23
Received: 23 December 2017
Accepted: 12 April 2018
First Online: 23 April 2018
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: This was a study based on register data. Survivors are informed about their participation and can afterwards withdraw their inclusion in the registry. Since the start of the registry in 1990 only a handful of patients have withdrawn their participation. Deceased patients are included without consent. The Regional Ethical Review Board in Stockholm, Sweden approved the study, Dnr 2013/1959-31/4.
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