I give blood on a regular basis. I'm type O so they love me. I usually don't check off on the marrow thing and it's not really explained, and I don't bother asking. If there's a possibility of compensation for it now, shit I'll ask and more than likely check the box.
Incentives for wanted behaviors... what a concept!
http://4.bp.blogspot.com/-7UyesaqfeF...oreYouKnow.jpg
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