Department of Pediatrics Jinling Hospital Nanjing University School of Medicine Nanjing 210002 China;
Department of Pediatrics The First Affiliated Hospital of Sun Yat—Sen University Guangzhou 510080 China;
Department of Pediatric Nephrology Children’s Medical Center Second Xiangya Hospital Central South University Changsha 410011 China;
Department of Nephrology and Rheumatology Children’s Hospital of Fudan University Shanghai 201102 China;
Frequently relapsing nephrotic syndrome; Mizoribine; Pharmacokinetic parameters;