Article History
Received: 10 September 2018
Accepted: 7 January 2019
First Online: 10 January 2019
Conflict of interest
: Ahmed Hagiga, Mohamed Aly, Mariia Gultiaeva, and Henry Murphy declare that they have no conflict of interest.
: Informed consent was not required because this was a review study.
: For this type of study, formal consent from a local ethics committee is not required.