Citation: Jakovljevic MM and Varjacic M (2017) Commentary: Do health care workforce, population, and service provision significantly contribute to the total health expenditure? An econometric analysis of Serbia. Front. Pharmacol. 8:33. doi: 10.3389/fphar.2017.00033 Commentary: Do health care workforce, population, and service provision significantly contribute to the total health expenditure? A...