“Investigating The Effect of of Pharmacist Educational Intervention on the Proper Use of Insulin Pen in Older Patients with Type 2 Diabetes Mellitus in Primary Health Care and Diabetic Centres in Makkah Al-Mukarramah, Saudi Arabia”, IJPHRD, vol. 11, no. 12, pp. 174–180, Nov. 2020, doi: 10.37506/ijphrd.v11i12.13235.