The John A. Sweaney Lecture: Durbin, South Africa, April 2013, given by Dr Louis Sportelli. The 100 year test: can that tell us something?

The following is The John A. Sweaney Lecture delivered by Dr Louis Sportelli at the Biannual Assembly of the World Federation of Chiropractic in Durban, South Africa, on April 12, 2013.