Fragmented QRS, a strong predictor of mortality and major arrhythmic events in patients with nonischemic cardiomyopathy: A systematic review and meta‐analysis oleh Moein Zangiabadian, Mohammad Sharifian Ardestani, Malihe Rezaee, Elahe Saberi Sharbabaki, Mahdi Nikoohemmat, Mohammad Eslami, Kian Goudarzi, Mojgan Sanjari, Mohammad Hasan Namazi, Mohammad Ali Akbarzadeh, Azadeh Aletaha