1\cite{Hilgers_2016} \cite{Shoshi_2018}
2 3-5\cite{Feinstein1970} \cite{Su2016} \cite{Prosser2010}
3 6-9 \cite{Stebbings1972} \cite{Frangogiannis2008} \cite{Cazzola_2010} \cite{Y_ez_2018} \cite{Adams_2006}
4 10-13 \cite{DiMasi2003} \cite{Munos2009} \cite{Langhauser_2018} \cite{Uszczynska-Ratajczak2018}
5 14-18 \cite{Booton2014} \cite{Vencken2015} \cite{Murakami2015,Sekar2019}
6 19 - \cite{Drevytska_2018} \cite{Shoshi_2018} \cite{Saik_2018} \cite{Hamzeiy_2017}