The present study was conducted according to the 6th revised Declaration of Helsinki (Edinburgh, 2000) and Good Clinical Practice Guidelines and was approved by the local ethics committee of the Clinical Hospital Centre Zagreb. All the patients signed informed consent form for lumbar puncture, genetic research and for participation in this study. The consent form was explained in details to the patients and their legal guardians/caregivers. All procedures were approved by the Central Ethical Committee of the University of Zagreb Medical School (case no. 380‐59/11‐500‐77/90, class 641‐01/11‐02, signed on 19 May 2011).
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