Trastuzumab‐induced toxic epidermal necrolysis in a Her‐2‐positive metastatic breast cancer patient—A rare case report oleh Jannatul Ferdause, Sura Jukrup Momtahena, Rubama Karim, Aditi Paul Chowdhury, Nowshin Taslima Hossain, Md Ariful Islam, Maruf Bin Habib, A. K. M. Shafiul Kadir, Md Ariful Haque