Wu, Q., Tchetgen, E. J. T., Osypuk, T. L., White, K., Mujahid, M., & Glymour, M. M. (2013). Combining direct and proxy assessments to reduce attrition bias in a longitudinal study.

Wu, Qiong, Eric J. Tchetgen Tchetgen, Theresa L. Osypuk, Kellee White, Mahasin Mujahid, ja M. Maria Glymour. Combining Direct and Proxy Assessments to Reduce Attrition Bias in a Longitudinal Study. 2013.

Wu, Qiong, et al. Combining Direct and Proxy Assessments to Reduce Attrition Bias in a Longitudinal Study. 2013.