div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader042vdocumentscombrreader042viewer2022020522575067e41a28ab0f07ad9fb0html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: School Hygiene in São Paulo src=https:reader042vdocumentscombrreader042viewer2022020522575067e41a28ab0f07ad9fb0html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp©1941 Nature Publishing Grouppdiv