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Table 5 Validation for assessment of melatonin levels in one body fluid versus another. ‘V’ means validation exist, ‘?’ means that, to our knowledge, no validation exists

From: Melatonin levels in the Alzheimer’s disease continuum: a systematic review

  AD continuum Healthy volunteers
CSF versus pineal gland V ?
Blood versus CSF ? V
Saliva versus blood ? V
Urine versus blood ? V