Extended interview: Dr. Sanjay Gupta

In this web exclusive, Dr. Sanjay Gupta, a neurosurgeon and chief medical correspondent for CNN, talks with « Sunday Morning » host Jane Pauley about his new book, « It Doesn’t Have to Hurt: Your Smart Guide to a Pain-Free Life. » He discusses pain, which he calls « the most mysterious of all human sensations, » and about the misconceptions about treating it.