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Authors
Cui, Chunhua https://orcid.org/0000-0002-2774-1576
Heggen, Marc
Zabka, Wolf-Dietrich
Cui, Wei https://orcid.org/0000-0001-9167-4008
Osterwalder, Jürg
Probst, Benjamin
Alberto, Roger
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Article History
Received: 8 June 2017
Accepted: 26 September 2017
First Online: 7 November 2017
Competing interests
: The authors declare no competing financial interests.
