Received: 7 December 2020
Accepted: 6 April 2021
First Online: 26 April 2021
: Ethical approval was obtained from the ethical committees of all participating countries in accordance with local regulations. Informed consent was obtained from all subjects. Participating subjects were free to decline participation any time during the course of the study. Data were collected and stored under specific codes with an assurance of anonymity and data confidentiality. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.