First aid for the USMLE Step 1 2013 : a student-to-student guide / Tao Le ... [et al.]. - New York : McGraw-Hill, 2013. - xxiv, 694 p. : ill. ; 28 cm. ISBN: 9780071802321 RM138.08 Subjects--Topical Terms: Medicine.Licensure, Medical. Index Terms--Genre/Form: Examination Questions.