本文作者： ZHANG CHUNMEI, 21ST CENTURY STAFF
This is the first time that Li Guifeng, 52, a cleaner on the campus of Peking University (PKU), has seen a doctor since she had an operation on her thyroid gland several years ago. She was reluctant to walk into the university’s hospital until she was greeted by the warm smile of student Jiang Xiaoxiao.