TY - JOUR AU - Shahidi, N; Ou, G; Lam, E TI - When trainees reach competency in performing endoscopic ultrasound: a systematic review JO - Endosc Int Open VL - 5 PY - 2017 DO - 10.1055/s-0043-100507 L3 - PubMed-ID: 28367496 SP - E239 EP - e243 N1 - et al. ER -