Waqas, Saad Ahmed, Taimor Mohammed Khan, Ahmed Kamal Siddiqi, Shahzad Hassan, and Stefan D. Anker. “The Impact of Frailty on in-Hospital Outcomes in Patients With HFrEF”. Global Cardiology 3, no. 4 (December 17, 2025). Accessed February 1, 2026. https://www.globalcardiology.info/site/article/view/88.