Data collection
Clinical, laboratory, and treatment data relevant to the AF management of each participating patient were collected through electronic and/or paper medical record review by trained study abstractors at baseline and 12 months. Three sources of costing and resource use data were collected as part of the study: case costing data, self-administered questionnaire (12 months), and monthly diaries. Each dataset was designed to evaluate different types of costs. A detailed description of each source of costing and resource use data is provided below.