http://www.ucdmc.ucdavis.edu/fpnetwork/ApplicD.html

https://medschool.ucsd.edu/international/professional-development/Pages/Masters-Clinical-Research.aspx

https://www.uclahealth.org/international-services/international-physician-observership-program

http://www.usmle-forums.com/usce-clinical-rotations/8178-trying-find-externships-usa.html

http://www.usmle-forums.com/usce-clinical-rotations/109090-observerships-bay-area-california.html

http://rogerwashington.com/externship-program/

http://www.usmleforum.com/files/forum/2014/4/777914.php

http://www.mleresidencytips.com/2011/10/types-and-opportunities-for-usce.html

http://www.imgforum.com/viewtopic.php?t=738

https://im-for-imgs.com/2012/01/03/observerships/