APA (7th ed.) Citation

Li, L., Sun, X., Tan, J., Liu, M., Wang, W., Lu, K., . . . Guo, J. J. Impact of time-varying exposure on estimated effects in observational studies using routinely collected data: Protocol for a cross-sectional study. BMJ Publishing Group.

Chicago Style (17th ed.) Citation

Li, Ling, Xin Sun, Jing Tan, Mei Liu, Wen Wang, Kevin Lu, Guowei Li, Jiayue Xu, and Jeff Jianfei Guo. Impact of Time-varying Exposure on Estimated Effects in Observational Studies Using Routinely Collected Data: Protocol for a Cross-sectional Study. BMJ Publishing Group.

MLA (9th ed.) Citation

Li, Ling, et al. Impact of Time-varying Exposure on Estimated Effects in Observational Studies Using Routinely Collected Data: Protocol for a Cross-sectional Study. BMJ Publishing Group.