Cui, Xiaotong
Mandalenakis, Zacharias
Thunström, Erik
Fu, Michael
Svärdsudd, Kurt
Hansson, Per-Olof http://orcid.org/0000-0001-6323-0506
Article History
Received: 23 May 2020
Accepted: 13 July 2020
First Online: 21 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Research ethics approval was obtained on several occasions, first from the Research Ethics Committees in Gothenburg and Uppsala, Sweden, and later from the Regional Ethics Review Board, Uppsala, Sweden, No. 2011/304.
: Informed consent was obtained at each examination, orally during the first examinations, as required at the time, and in writing later on, according to the Helsinki Declaration.
: All authors have reviewed and made the final approval of the manuscript to be submitted and published. The consent for publication from participants is not applicable for almost all participants have died.
: Not applicable.