About 30 to 50 pecent of American children and adults don't get enough vitamin D, says coauthor James O'Keefe, M.

CNN: Vitamin D may be essential for heart health

"When you have Shaun Edwards barking at you after performances where you haven't been successful, then I'm sure that's going to change, " said O'Driscoll.

BBC: Centurion Brian O'Driscoll hails Wales' Stephen Jones