Global Pacemakers Market Assessment, By Implantability [Implantable, External], By Technology [Single Chamber Pacemaker, Dual Chamber Pacemaker, Biventricular/CRT Pacemaker], By Type [Conventional, MRI Compatible], By Indication [Arrhythmias, Congestive Heart Failure, Others], By End-user [Hospitals and Cardiac Centers, Ambulatory Surgical Centers], By Region, Opportunities and Forecast, 2017-2031F