Estimating clinical stage of amyotrophic lateral sclerosis from the ALS Functional Rating Scale. - Balendra, Rubika; Jones, Ashley; Jivraj, Naheed; Knights, Catherine; Ellis, Catherine M.; Burman, Rachel; Turner, Martin R.; Leigh, P. Nigel; Shaw, Christopher E.; Al-Chalabi, Ammar (Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration, 2014)