Adherence to antihypertensive medications in Omani patients: a comparison of drug biochemical analysis and the Morisky Medication Adherence Scale. - Al-Ani A; Al Suleimani Y; Ritscher S; Toennes SW; Al-Hashar A; Al-Zakwani I; Al Za'abi M; Al Hashmi K (Journal of hypertension, 2025)