اضغط هنا لزيارة موقع الرابط
http://loop.frontiersin.org/publications/47711176
http://opendepot.org/4240/
https://www.mysciencework.com/publication/show/impact-pain-management-using-analgesic-ladder-children-cancer-south-egypt-cancer-institute-assiut-university-a6fd93aa
https://www.mysciencework.com/publication/show/impact-pain-management-using-analgesic-ladder-children-cancer-south-egypt-cancer-institute-assiut-university-0c17046c
https://www.infona.pl/resource/bwmeta1.element.ID-3776865d-9f32-48fd-a3db-433c72270a9a
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