Intra-Individual Variability of Direct Oral Anticoagulant Levels in Frail Older Patients upon, during, and after Acute Hospitalization: the DOAC-FRAIL Study.

Competing Interests: Disclosure H.t.C. received research support from Bayer and Synapse, and advisory board and consultancy fees from Alveron, Galapagos, Novostia, and Astra Zeneca. He is shareholder with Coagulation Profile. All revenues are deposited at CARIM for research purposes. All other authers declare no conflicts of interest.