Buisseret, P., & Singelyn, F. (1998). Perioperative blood losses after total hip replacement (THR): Comparison between continuous “3-in-1” block (CB), epidural anesthesia (EA) and IV PCA. Anesthesia and Analgesia, 86(2S). https://doi.org/10.1097/00000539-199802001-00260 (Original work published 1998)