CNN's Sanjay Gupta did a three part indepth story
Post# of 15624
IT would probably answer some of your questions if you watched it..
https://www.youtube.com/watch?v=-SZzgfyXhJI&a...ture=share
https://www.youtube.com/watch?v=ZngmYn41Vwk&a...ture=share
https://www.youtube.com/watch?v=Idujb84MwPE&a...ture=share