- public library of science13
- elsevier bv7
- cell press6
- elsevier b.v.6
- elsevier inc.6
- escholarship, university of california6
- addenbrookes hosp, clin gerontol unit, cambridge, england.5
- albert einstein coll med, dept epidemiol & popualt hlth, bronx, ny 10467 usa.5
- amgen inc, decode genet, reykjavik, iceland.5