Cobalt cardiomyopathy in hip arthroplasty oleh Muhammad Umar, BSc, MBBS, DipSEM, FRCS, Noman Jahangir, MBBS, FRCS, Muhammad Faisal Khan, MBBS, FRCS, Zobia Saeed, MBBS, MSc, Farina Sultan, MBBS, MSc, Ayyaz Sultan, MBBS, FRCP, FACC, FAHA