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Ayres, Annelise; Jotz, Geraldo Pereira; Rieder, Carlos R. M.; Olchik, Maira Rozenfeld . (2017). Benefit from the Chin-Down Maneuver in the Swallowing Performance and Self-Perception of Parkinson’s Disease Patients. Parkinson's Disease, 2017(), 1–8. doi:10.1155/2017/7460343 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research