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Time: 2024-03-28T18:10:28Z
URL: http://scholar.google.com/scholar_lookup?title=Salivary+melatonin+as+a+circadian+phase+marker%3A+validation+and+comparison+to+plasma+melatonin&year=1997&author=Voultsios&journal=J+Biol+Rhythms&volume=12&issue=5&pages=457-466&pmid=9376644