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Ng, Cheng-Ann Winston; Jiang, Amy Aimei; Toh, Emma Min Shuen; Ng, Cheng Han; Ong, Zhi Hao; Peng, Siyu; Tham, Hui Yu; Sundar, Raghav; Chong, Choon Seng; Khoo, Chin Meng . (2020). Metformin and colorectal cancer: a systematic review, meta-analysis and meta-regression. International Journal of Colorectal Disease, (), –. doi:10.1007/s00384-020-03676-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research