Authors: Yasser Nabil, FDSRCS England, FDSRCS Edinburgh, FDSRCS Glasgow.
Authors: Duane C Keller.
Authors: Mohammed E. Rokaya, Wael Hussein Kamel, Khalid S Hassan.
Authors: Mouhibi Abdalah, Amessegher Fatima Zahra, Maftouh Boutaina, Amine Chafii, Andoh Abderrahmane.