Michael I. Pupin was a professor at the University of Columbia. member and the president of Academy of Science in New York; one of the esteemed members of USA National Academy of Science; member and president of many experts and scientific institutions and societies in the USA; member of State Council for Scientific Research by president of the USA during the World War I. Of the great... https://mysocialfeeder.com/story4381580/posi%C3%A7%C3%B5es-verticalizadas-no-parto-e-a-preven%C3%A7%C3%A3o-de-lacera%C3%A7%C3%B5es-perineais-revis%C3%A3o-sistem%C3%A1tica-e-metan%C3%A1lise