The Enhancement of Sperm Retrieval Rate in Cases of Non-Obstructive Azoospermia Via Collagenase IV Enzyme Treatment in Combination with Mechanical Extraction. International Journal of Emerging Trends in Science and Technology, [S. l.], v. 2, n. 06, 2015. Disponível em: https://www.ijetst.in/index.php/ijetst/article/view/731. Acesso em: 24 oct. 2026.