Virk, Ghazala S., et al. “Association Between Polypharmacy and Cardiovascular Outcomes in Frail Elderly Patients: Systematic Review and Meta-Analysis”. Cardiology and Cardiovascular Medicine, vol. 9, no. 5, Sept. 2025, pp. 380-92, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/16636.