FILE - In this Sept. 21, 2017 photo, the home of Ashley Toledo's mother lays in ruins after the passing of Hurricane Maria in the Punta Diamante area of Ponce, Puerto Rico. Researchers said on April 22, 2021, they are launching a survey of the causes of deaths following the Category 4 storm to clear up questions about a death toll that analysts so far have attributed to factors such as power outages, building failures, and damaged roads. (AP Photo/Jorge A Ramirez Portela, File)