CJCP     2005 7 (5):  435-438    ISSN: 1008-8830  CN: 43-1301/R Difficult and complicated case study: biotinidase deficiency ZOU Li-Ping, WANG Xu Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China. Email: zouliping21@hotmail.com Received: null  Revised: null  Online: null Supporting info