div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader042vdocumentsusreader042viewer2022020523575068691a28ab0f07b008f6html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Variations for clinicians src=https:reader042vdocumentsusreader042viewer2022020523575068691a28ab0f07b008f6html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1982pdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader042vdocumentsusreader042viewer2022020523575068691a28ab0f07b008f6html5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: Variations for clinicians src=https:reader042vdocumentsusreader042viewer2022020523575068691a28ab0f07b008f6html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1982pdiv