Table 1. Database search results for foreign body, electric battery, gastrointestinal hemorrhage and hemorrhagic shock on May 22, 2013.

Electronic databases	Search strategies	Results
Medline (PubMed)	(Electric Power Supplies) AND (Foreign Bodies) AND (Gastrointestinal Hemorrhage) AND (Shock, Hemorrhagic)	No original articles, case reports or review articles
Embase (Elsevier)	(Electric Battery) AND (Gastrointestinal Hemorrhage) AND (Hemorrhagic Shock)	No original articles, case reports or review articles
Lilacs (Bireme)	((Foreign Bodies) OR (Cuerpos Extraños) OR (Corpos Estranhos)) AND ((Gastrointestinal Hemorrhage) OR (Hemorragia Gastrointestinal) OR (Hemorragia Gastrointestinal)) AND ((Shock, Hemorrhagic) OR (Choque Hemorrágico) OR (Choque Hemorrágico))	No original articles, case reports or review articles