TY - JOUR AU - Ray, Michael J TI - An Artefact Related to the Ratio of Sample Volume to the Blood Collection Vial Size which Effects the APTTs of Specimens Taken to Monitor Heparin Therapy SN - 0340-6245 SN - 2567-689X PY - 1991 JO - Thromb Haemost JF - Thrombosis and Haemostasis LA - EN VL - 66 IS - 09 SP - 387 EP - 388 DA - 2018/07/25 PB - Schattauer GmbH DO - 10.1055/s-0038-1646424 UR - http://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0038-1646424 ER -