Table 2  Eligibility requirements for visiting medical student elective and clerkship programs at US and Puerto Rico allopathic medical schools (n = 73)a.
Requirement  No. (%) of Responses
Documentation of immunizations  67 (92)
Clinical experience, wk  62 (85)
 <16  1 (2)
 16-32  5 (7)
 33-48  38 (52)
 >48  13 (18)
 Left item blank  5 (7)
Successful completion of the USMLE Step 1  37 (51)
Letter of recommendation  27 (37)
Medical school transcript  26 (36)
Abbreviation: USMLE, United States Medical Licensing Examination.
a Responses to question 16 in Additional file 1.