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Patricia S Choban; Jacqueline Onyejekwe; Jean C Burge; Louis Flancbaum. (1999). A health status assessment of the impact of weight loss following Roux-en-Y gastric bypass for clinically severe obesity. , 188(5), 491–497. doi:10.1016/s1072-7515(99)00030-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research