"In 2011, I started to notice that my right pec was deteriorating," Hoffmann, 28, writes in Monday's piece. "I could see it in pictures and in my reflection in the mirror. So I started to seek the help of specialists all over the country, and even several in Canada. That was the beginning of a five-year period of misdiagnoses, frustration and confusion. I visited over 25 doctors. While they were 'racking their brains,' my weakness progressed, my swing speed decreased and I continued to lose muscle in my chest. Today my entire right pec is almost gone."