In this video Greg describes the first Iron Shot session when he recieved three seperate shots in the bum. It starts at at about minute 38 - chapter 10
http://fora.tv/2008/02/17/Ethics_Doping_and_the_Future_of_Cycling
The author of the Sports Illustrated article describes the second session a couple of stages later fyi. It would make sense that Greg continued taking Iron Shots until his anemia was defeated.
BTW, there is nothing wrong with Iron Shots.
There just seemed to be confusion over "single-shot" versus "Mutiple-Shots".
There was no "single-shot" lol.