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Javelle, Florian; Lampit, Amit; Bloch, Wilhelm; Häussermann, Peter; Johnson, Sheri L; Zimmer, Philipp . (2019). Effects of 5-hydroxytryptophan on distinct types of depression: a systematic review and meta-analysis. Nutrition Reviews, (), nuz039–. doi:10.1093/nutrit/nuz039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research