Using an old test for new tricks: Measuring direct oral anti‐Xa drug levels by conventional heparin‐calibrated anti‐Xa assay. Issue 5 (21st February 2019) - Maier, Cheryl L.; Asbury, William H.; Duncan, Alexander; Robbins, Adele; Ingle, Ann; Webb, Adam; Stowell, Sean R.; Roback, John D.