TY - BOOK AU - Keats, Theodore E. AU - Anderson, Mark W. TI - Atlas of normal roentgen variants that may simulate disease SN - 9780323043007;0323043003 PY - 2007/// CY - Philadelphia, Pa. PB - Mosby Elsevier KW - Artifacts KW - Diagnostic Errors KW - Radiography N1 - Includes index ER -