Changes in Testosterone Levels Following Surgical Sperm Retrieval in Men with Non-Obstructive Azoospermia: Systematic Review and Meta-Analysis by Wael Zohdy, Rupin Shah, Christopher Chee Kong Ho, Gokhan Calik, Vineet Malhotra, Bircan Kolbaşı Erkan, Mesut Berkan Duran, Georgios Tsampoukas, Garaz Radion, Ramadan Saleh, Ahmed M. Harraz, Parviz Kavoussi, Eric Chung, Edmund Ko, Luca Boeri, Naveen Kumar, Selahittin Çayan, Amarnath Rambhatla, Osvaldo Rajmil, Mohamed Arafa, Rossella Cannarella, Omer Raheem, Taymour Mostafa, Widi Atmoko, Taha Abo-Almagd Abdel-Meguid Hamoda, Armand Zini, Ashok Agarwal