Liang Zheng, Ph.D, Master tutor, Associated Professor of Tongji University, Visiting Professor of Baotou central hospital (Affiliated hospital of Inner Mongolia Medical University), Visiting scholar at the Medical School of Massachusetts University, and Senior Statistician of Johnson & Johnson Pharmaceutical - International Jing Ding Pharmaceutical Office in Shanghai, the reviewer of several journals such as Oncotarget Journal, European Journal of Clinical Nutrition, Bioscience Reports, Journal of Tongji University et al. Committee member of Chinese Medical Association Clinical Epidemiology Branch; Committee member of Chinese Health Care Promotion Association Evidence based medicine branch; Committee member of Shanghai Medical Association Clinical Epidemiology Branch.