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Mitchell, Ulrike H.; Mack, Gary L. . (2013). Low-Level Laser Treatment with Near-Infrared Light Increases Venous Nitric Oxide Levels Acutely. American Journal of Physical Medicine & Rehabilitation, 92(2), 151–156. doi:10.1097/phm.0b013e318269d70a 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research