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Efficacy of melatonin for sleep disturbance in middle-aged primary insomnia: a double-blind, randomised clinical trial

Concentrations decline sharply with age: plasma levels drop from roughly 200 ng/mL at age 20 to under 80 ng/mL by age 60

Guidelines for diagnosis and management of the cobalamin-related remethylation disorders cblC, cblD, cblE, cblF, cblG, cblJ and MTHFR deficiency

Even though that deviates from the principle of diversification, it is attractive to some investors for psychological reasons
