Article History
First Online: 22 May 2019
Compliance with ethical standards
:
: M. Drenska, V. Grigorova, S. Elitova, E. Naseva, I. Getov have no conflicts of interest that are directly relevant to the content of this article.
: No sources of funding were used to conduct this study or prepare this manuscript.
: This retrospective study is based on recorded data and approval from owners of the data was received.
: Data confidentiality of all prescription records were respected at all time. Information about the identity of the patients was not collected.