Four months after their release from the hospital, more than half of 238 adult COVID-19 patients in northern Italy still had impaired lung function or mobility issues, and about one-fifth had symptoms of posttraumatic stress disorder (PTSD), a prospective cohort study published yesterday in JAMA Network Open found.The findings add to growing evidence and discussion of so-called COVID-19 "long-haulers," or patients with function-impairing symptoms persisting for months after their initial recovery.Researchers from two universities in Novara, Italy, assessed the patients, who had been hospitalized from Mar 1 to Jun 29, 2020.