The following quote is attributed to Paul A. Offit, MD, by a number of websites and books; they can be found by Googling for the exact quote in quote marks (screenshot below)
Aluminum is considered to be an essential metal with quantities fluctuating naturally during normal cellular activity. It is found in all tissues and is also believed to play an important role in the development of a healthy fetus.
The source of the quote is given as website of Children's Hospital of Philadelphia (CHOP) Vaccine Education Center, dated in April 2013.
The closest present day webpage on this subject is http://www.chop.edu/centers-programs/vaccine-education-center/vaccine-ingredients/aluminum
I have tried to use the "Wayback Machine" archives to try to find this quote in original form, but have not succeeded. Thus is the temporal nature of internet publishing; contrary to the "it's out there forever" reputation.
So my question is: Did Paul Offit actually say (write) this?