Dr. Spady, you may want to chime in, as well.
I believe that one of the most contentious issues you're raising is the issue of thimerosal or mercury-based preservatives in vaccines, which was phased out for childhood vaccines several years ago. It's still in the flu vaccine, which raises some concerns.
We did a review with experts at Toronto Public Health to answer that, because these questions definitely have come up in response to these educational materials. While we need more evidence, we decided to go with the prevailing public health message, which is that the benefit of vaccines outweighs the uncertain science of contaminants in vaccines thus far. I would say that the jury is still out.
We felt the need to make that response to these concerns because of the involvement of public health departments in our partnership and because we drew upon their advice.
I think Dr. Spady might want to add something.