Pieper, Dawid
Koensgen, Nadja
Breuing, Jessica
Ge, Long
Wegewitz, Uta
Article History
Received: 13 October 2017
Accepted: 10 June 2018
First Online: 18 June 2018
Ethics approval and consent to participate
: Not applicable (the study did not involve human participants).
: Not applicable.
: DP is senior author of one of the included studies. Beside this, the authors declare that they have no competing interests.
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