Humans / Child / Female / Male / Differential Diagnosis / Systematic review / Intestinal Obstruction / Public health systems and services research / Perforation / Gastrointestinal Tract / Congenital malformation / Management Strategy / Radiopharmaceuticals / Age Groups / Meckel diverticulum / Systematic review / Intestinal Obstruction / Public health systems and services research / Perforation / Gastrointestinal Tract / Congenital malformation / Management Strategy / Radiopharmaceuticals / Age Groups / Meckel diverticulum