Using twin studies to label disease as genetic or environmental is inappropriate.
MacGregor
Alex J
AJ
Lanchbury
Jerry
J
Rigby
Alan S
AS
Kaprio
Jaakko
J
Snieder
Harold
H
D001172:Arthritis, Rheumatoid / Q000235:genetics*; D004200:Diseases in Twins / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D012107:Research Design; D018433:Twin Studies as Topic