Design using historical controls.
Yen
Albert
A
Department of Neurology, Baylor College of Medicine, Houston, Texas, USA.
Simpson
Ericka
E
Haverkamp
Lanny
L
Appel
Stanley
S
D000690:Amyotrophic Lateral Sclerosis / Q000266:history*; D015982:Bias; D002986:Clinical Trials as Topic / Q000379:methods*; D003627:Data Interpretation, Statistical; D019992:Databases as Topic / Q000706:statistics & numerical data; D005500:Follow-Up Studies; D049673:History, 20th Century; D006801:Humans; D012107:Research Design; D012189:Retrospective Studies; D013997:Time Factors