<page_title> Weekend effect </page_title> <section_title> Published research: Summary </section_title> <table> <cell> Shaheen <col_header> Author </col_header> </cell> <cell> 2009 <col_header> Year </col_header> </cell> <cell> USA <col_header> Country </col_header> </cell> <cell> 237412 <col_header> Number Patients </col_header> </cell> <cell> Upper GI Bleed <col_header> Disease </col_header> </cell> </table>
In 2009, Shaheen studied 237,412 patients with UGI bleed in the US.