Effectiveness and safety assessment of calcium channel blockers compared to beta blockers in patients with angina: An observational study

Shama Abidi, Saira Saeed Khan, Sadaf Naeem, Humera Siddiqui, Sumaira Khadim, Saima Saleem, Saira Erum Ejaz, Syed Ishtiaq Rasool, Syeda Maheen Zahidi