Effect of referral bias on assessing survival in als.
Logroscino
G
G
Beghi
E
E
Hardiman
O
O
Chio
A
A
Mitchell
J D
JD
Swingler
R J
RJ
Traynor
B
B
D000690:Amyotrophic Lateral Sclerosis / Q000401:mortality*; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D016021:Epidemiologic Studies; D005060:Europe / Q000453:epidemiology; D006801:Humans; D008910:Minnesota / Q000453:epidemiology; D018401:Sample Size; D015983:Selection Bias; D016019:Survival Analysis