i vaguely remember that there was some place on the CAF for clinical rotations and i think you put the name and city of the hospital and when you did the rotations...or at least a place for clinical experiences, so i think they will know that way.
also your LoRs will be from people that had you as a student in a rotation, and they usually mention that fact.
Come July 2013- Endocrinology Fellow
ABIM certified, fully licensed, IM
ValueMD-the place "where nothing makes sense, but everything is related-fellow vmd'r gabon