Ucwaningo lwakamuva olushicilelwe ku-JAMA Network Open, abacwaningi base-United States of America (US) baphenye ubudlelwano phakathi kwesikweletu sezokwelapha kanye nemiphumela yezempilo yabantu e-US. Bathola ukuthi isikweletu sezokwelapha sihlotshaniswa nesimo sempilo esibi nokwanda kokufa ngaphambi kwesikhathi kanye nokufa kwabantu.