Received: 8 February 2019
Accepted: 26 June 2019
First Online: 26 July 2019
Ethics approval and consent to participate
: The study protocol was in accordance with the Helsinki Declaration and international ethical standards. The study protocol has been approved and administrative permission to access raw data was granted by the Institutional Ethical Board of South Pest Central Hospital, National Institute of Hematology and Infectious Diseases (Issue No. IKEB/37/2016). Obtaining informed consent is not required for this type of study.
: Not applicable.
: The authors declare that they have no competing interests.