A spurious correlation.
Atkinson
Greg
G
Watson
Philip
P
Maughan
Ronald J
RJ
Shirreffs
Susan M
SM
Nevill
Alan M
AM
D001923:Brain Chemistry / Q000502:physiology*; D003627:Data Interpretation, Statistical; D006801:Humans; D012701:Serotonin / Q000378:metabolism*; D014364:Tryptophan / Q000097:blood*
D012701:Serotonin; D014364:Tryptophan