na INLIS000000000002855 20231116011905 0010-061600000002854 231116 0 eng 0-683-03269-0 614.4 Fle c Fletcher, Robert H. Clinical Epidemiology: The Essentials / Robert H. Fletcher; Suzanne W. Fletcher; Edward H. Wagner USA : Williams & Wilki, 1988. epidemiologi 614.4 Fle c ix, 276 p, ; 23 cm. 110440