1 Department of Biostatistics, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China.
2 Healthcare Big Data Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China.
3 Center for Big Data Research in Health and Medicine, the First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Jinan, Shandong, P. R. China.
4 Shandong Qianfoshan Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China.