SAN FRANCISCO (AP) -- Gary Sheffield knew full well he was doping, and Jason Giambi was turned on to a cocktail of performance-enhancing drugs similar to what Barry Bonds was taking, according to a new book. "Game of Shadows," set for release Thursday, says BALCO's performance-enhancing drugs were used by several athletes, including track stars Marion Jones and Tim Montgomery, NFL players such as Bill Romanowski, and sluggers including Bonds, Sheffield and Giambi. It centers on Bonds' allegedly extensive drug regimen - steroids, human growth hormone, insulin and more - but also undercuts Sheffield's claims that he took designer steroids...