Patient demographics, disease characteristics, laboratory test results and medications used willl be collected by self reports and medical records. The severity of comorbid diseases will be recorded and scored according to Charlson comorbidity index (CCI) and patients will be divided into three groups: mild, with CCI scores of 1-2; moderate, with CCI scores of 3-4; and severe, with CCI scores ≥5. Polypharmacy will be defined as being on five or more medications at one time, DDIs will be checked with Lexicomp® and and potentially inappropriate medications will be defined with 2015 update of Beers criteria. Severe drug interactions will be defined with category D or X DIs.