I don't know why, unless they plan to use some type of contrast dyeand since caffiene acts as a diueretic, the dye would be excreted faster and wouldn't be in sufficient quantity in the circulation. I am only guessing. I don't know why.
Wishing you well. Sorry I didn't see your question sooner.Gary.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.