His bundle pacing, learning curve, procedure characteristics, safety, and feasibility: Insights from a large international observational study. - Keene, Daniel; Arnold, Ahran D; Jastrzębski, Marek; Burri, Haran; Zweibel, Steven; Crespo, Eric; Chandrasekaran, Badrinathan; Bassi, Sukhbinder; Joghetaei, Nader; Swift, Matthew; Moskal, Pawel; Francis, Darrel P; et al. (Journal of Cardiovascular Electrophysiology, 2019)