Allore, Heather G., Yuming Ning, Cynthia A. Brandt, and Joseph L. Goulet. “Accounting for the Hierarchical Structure in Veterans Health Administration Data: Differences in Healthcare Utilization Between Men and Women Veterans”. International Journal of Statistics in Medical Research 2, no. 2 (April 30, 2013): 94–103. Accessed May 5, 2024. https://www.lifescienceglobal.com/pms/index.php/ijsmr/article/view/1106.