The center for disease control has a good website. Just Google for this and look in there. I have reviewed this in my Mosby books also. Sorry I don't have anything more than that. I am taking my test March 8th and I am scared to say the least but I also can't wait to take it I want it over with. I look at it this way If I fail I will retake it nothing wrong with that. Goodluck on your retake I know you will do great this time I will keep you in my prayers.