Tawfik EA, Cartwright MS, Grimm A, Boon AJ, Kerasnoudis A, Preston DC, Wilder-Smith E, Axer H, Hobson-Webb LD, van Alfen N, Crump N, Shahrizaila N, Inkpen P, Mandeville R, Sakamuri S, Shook SJ, Shin S, Walker FO. Neuromuscular ultrasound competency assessment: Consensus-based survey. Muscle Nerve. 2021 05; 63(5):651-656.