title: Disenrollment effects in insurer-based utilization studies: a comment on Griffith and Baloff.
mesh_terms: D006123:Group Practice / Q000706:statistics & numerical data*; D006125:Group Practice, Prepaid / Q000706:statistics & numerical data*; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D011336:Probability; D014481:United States