Article History
Received: 21 January 2020
Revised: 11 March 2020
Accepted: 20 March 2020
First Online: 27 April 2020
Compliance with ethical standards
:
: None.
: The study was approved by the local institutional review board (no. 57, January 26, 2017) and by the Research Ethics Committee of Fukushima Medical University School of Medicine (no. 2850, September 28, 2016).
: Informed consent for the present study was not mandatory according to the “ethical guidelines for medical and health research involving human subjects” in Japan.
: Not applicable