title: Reply to comments: "Membership Duration and Utilization Rates in a Prepaid Group Practice".
mesh_terms: D006123:Group Practice / Q000706:statistics & numerical data*; D006125:Group Practice, Prepaid / Q000706:statistics & numerical data*; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D008962:Models, Theoretical; D012107:Research Design / Q000592:standards*; D012621:Seasons; D013997:Time Factors