APRIL 9, 2020.....On the eve of what could prove to be a period of significant strain on the state's health care systems, the number of COVID-19 cases in Massachusetts climbed to nearly 19,000 and the number of residents who have died of the disease topped 500.Gov. Charlie Baker signed three executive orders Thursday aiming to expand the health care system's capacity and ensure access to COVID-19 treatment, including in field hospitals, as the anticipated surge of patients nears. [...]