Phuputsong ea morao-rao e phatlalalitsoeng ho JAMA Network Open, bafuputsi ba tsoang United States of America (US) ba ile ba batlisisa kamano lipakeng tsa mokoloto oa bongaka le liphetho tsa bophelo bo botle ba baahi ba US. Ba fumane hore mokoloto oa bongaka o amahanngoa le boemo bo mpe ba bophelo bo botle le ho eketseha ha lefu la pele ho nako le lefu bathong. Mokoloto ona o hokahane le litlamorao tse mpe bophelong, joalo ka tlhokomelo ea bophelo bo botle e liehang, ho se latele lengolo la ngaka le ho eketseha ha ho se sireletsehe ha lijo le matlo.