Only on the "CBS This Morning" podcast, singer and actor Kristin Chenoweth joins CBS News chief medical correspondent Dr. Jon LaPook to share why she's lending her voice to the "This is Pain" campaign, aimed at spreading awareness and eliminating the stigma surrounding chronic pain. Chenoweth opens up about her experience suffering from chronic pain ever since getting injured on a television set in 2012. She shares the treatments that have helped her manage the pain and why she decided to open up about her experience.