ageonset_Tier2
Item
Age at PD onset (cases only), Tier2
text
agestudy_Tier2
Item
Age at entry into study, Tier2
text
Item
Case-control status, Tier2
text
Code List
Case-control status, Tier2
labid_Tier2
Item
Dummy identifier, Tier2
text
matchnum_Tier2
Item
Identifier for each case-control pair, Tier2
text