(David Goldman | AP file photo) In this Feb. 9, 2018, photo, a nurse hooks up an IV to a flu patient at Upson Regional Medical Center in Thomaston, Ga. Researchers found in a study of credit reports that more than 2 percent of adults had medical bills under $200 sent to a collections agency. More than half of the annual medical collections were for less than $600, according to the study, which examined 2016 credit reports for more than 4 million unidentified people.