Amyotrophic lateral sclerosis (ALS) is a rare, but fatal, progressive neurodegenerative disease that affects the nerve cells in the brain and the spinal cord (NINDS, 2013). ALS is often referred to as ""Lou Gehrig's Disease"" after the famous baseball player who was diagnosed with it in the 1930s (Mayo Clinic, 2014). ALS severely impacts physical functioning and initially presents with muscle twitching, weakness in an arm or leg, or sometimes with slurring of speech. Eventually, people with ALS lose their ability to control the muscles needed to move, speak, eat, and breathe, which ultimately leads to death (Mayo Clinic, 2014). Globally, ALS accounts for approximately one in every 800 deaths (Majoor-Krakauer et al., 2003). The progressively degenerative course of the condition is a great burden for both patients and caregivers, as well as for society (Majoor-Krakauer et al., 2003). ALS usually occurs in people age ?40 years, and more often in men than women. ALS has a worldwide incidence of about two cases per 100,000 population, and a prevalence ranging between four and seven cases per 100,000 population (Eisen, 2002).