Technology for Biobanking of Epididymal Spermatozoa from Patient with Obstructive Azoospermia: Case Report about Baby Born after Conventional Freezing Only with a Nonpermeable Cryoprotectant 360 kDa Polyvinylpyrrolidone

梗阻性无精子症患者附睾精子生物样本库技术：仅使用不透膜冷冻保护剂360 kDa聚乙烯吡咯烷酮进行常规冷冻后成功分娩婴儿的病例报告