Assertion: als's disease | /r/DefinedAs | adult-onset
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text: It is frequently referred to as “Lou Gehrig's disease” in memory of the famous baseball player who died of ALS in 1941.2 ALS is defined as adult-onset, idiopathic, progressive degeneration of anterior horn cells and upper and lower motor neurons resulting in progressive muscle weakness, wasting and fasciculations.3–5(pp9–15)