Funding for this research was provided by:
Chinese Government Scholarship (201406170048)
Nordea-fonden (Center for Healthy Aging)
Horizon 2020 Framework Programme (Marie Skłodowska-Curie, 859853, Marie Skłodowska-Curie, 859853)
Article History
Received: 24 March 2020
Revised: 10 April 2020
Accepted: 13 April 2020
First Online: 8 May 2020
Compliance with ethical standards
:
: The authors declare no competing interests.