Brand Subclass: TPPs that indirectly purchased, paid and/or provided reimbursement for some or all of the purchase price of brand Zetia purchased between the but-for generic entry date and December 11, 2016, inclusive. Excluded from the Brand Subclass are Optum Health Part D Plans, Silverscript Part D Plans, Emblem Health Part D, Humana Part D Plans, Optum Health Managed Care Plans, and any TPPs that used one of these plans or OptumRx as its pharmacy benefits manager ("PBM") during this subclass period.