Received: 19 November 2019
Accepted: 29 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: The appropriate Ethical board of the State Physicans’ Chamber of Rhineland-Palatinate, Deutschhausplatz 3, 55116 Mainz approved the study under the Registration Number: “2018–133000-Epidemioloige” on 18. May 2018. All participants signed a written informed consent before participation in the study. Participation was voluntary.
: Not applicable.
: The authors declare that there is no conflict of interests.