Electronic Health Records System

A​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​ccording to the Institute of medicine, what are the four main components of electronic health records (EHR) system? Why​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​ have EHR systems not been widely adopted in the United States? How does the HITECH Act affect this slow adoption rate​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​?