Alfred Otto Mueck, 71, is helping a Beijing hospital develop a bank for ovarian-tissue preservation. Liu Xiangrui reports.

When local colleagues jokingly call him "a real friend of Chinese women", Alfred Otto Mueck smiles and says it is an honor to help Chinese women resolve their health issues. After all, the 71-year-old German specializes in obstetrics.

Over the past few years, Mueck's ties to China have grown. He continues to serve as a visiting professor at the Beijing Obstetrics and Gynecology Hospital and as an honorary director of its endocrinology unit.