Geographic variations in health care : what do we know and what can be done to improve health system performance? Paris : OECD, 2014. 415 s. OECD health policy studies. Available on Internet: <http://www.oecd-ilibrary.org/content/book/9789264216594-en> ISBN 978-92-64-21658-7. [Copy count : 1, currently available 1, at library only 0]