Prophylaxis for patients at Risk to Eliminate Post-operative Atrial Fibrillation (PREP-AF trial): a protocol for a feasibility randomized controlled study oleh Heather A. Smith, Salmaan Kanji, Diem T. T. Tran, Calum Redpath, Dean Ferguson, Tori Lenet, Greg Sigler, Sebastien Gilbert, Donna Maziak, Patrick Villeneuve, Sudhir Sundaresan, Andrew J. E. Seely