Rezk, Mohamed M.
Article History
Received: 27 October 2017
Accepted: 1 February 2018
First Online: 29 March 2018
Compliance with Ethical Standards
: The investigation protocol was approved by the ethics committee of nuclear material authority, which is performed in accordance with the ethical standards laid down in the US guidelines (NIH Publication no. 85-23, amended in 1985).
: The author declares that he has no conflict of interest.