Text ( visual ) : unmediated Health services research methods / Leiyu Shi. -- 3rd ed. -- Boston, Mass. : Cengage Learning , c2019. -- xv, 431 p. : ill. (chiefly col.) ; 29 cm. -- Includes bibliographical references (p. 394-416) and index. -- ISBN 9781133949671 ; (BB29889251) ; https://ci.nii.ac.jp/ncid/BB29889251 Author Heading(s): Shi, Leiyu