Etiology of Upper Gastrointestinal Bleeding in the Children Admitted to Besat Hospital in Sanandaj by Pedram Ataee, Mahtab Kakaie, Borhan Moradveisi, Rasoul Nasiri, Masoumeh Abedini, Daem Roshani, Armen Malekiantaghi, Kambiz Eftekhari

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