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surgery zagazig university 2018 department of general surgery department of surgery triple negative zagazig medical school medical students medicine breast royal college of surgeons john abernathy chamberlin family الزهراوي أبو بكر الرازي william morton robert liston joseph lister ignaz semmelweiss john hunter herophilus sushruta al-razi al-zahrawi anesthesia history her2 estrogen receptor modulator tamoxifin 2017 breast cancer mesh npwt vac guidelines 2014 guidelines classification of hernia ehs european hernia society yousef el-ayman closure of laparotomy closure of abdomen exploration abdomen incisional hernia laparotomy september journal club aromatase inhibitor egypt letrozole