Canadian superstar Céline Dion's Instagram announcement that she has been diagnosed with stiff person syndrome is sparking questions about the rare and widely unknown disease.
Rare Leader: Tara Zier, Founder and CEO of the Stiff Person Syndrome Foundation globalgenes.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from globalgenes.org Daily Mail and Mail on Sunday newspapers.