Text and Data Mining valid from 2020-01-14
Received: 13 November 2019
Accepted: 16 December 2019
First Online: 14 January 2020
Compliance with ethical standards
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that may be construed as a potential conflict of interest.
: The author states that this manuscript does not involve any misconduct such as plagiarism, forgery, tampering, improper signature, multiple submission, repeated publication, split publication, etc.
: Informed consent was obtained from all individual participants included in this study.