Received: 27 June 2019
Revised: 9 July 2019
Accepted: 10 July 2019
First Online: 18 July 2019
Compliance with Ethical Standards
: The author declares that he has no conflict of interest. This article for the Special Section was handled by the Guest Editor, Heino F. L. Meyer-Bahlburg.
: This article does not contain any studies with human participants performed by the author.