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- umea universitet, kirurgi12
- american college of physicians8
- uppsala universitet, ortopedi8
- wiley7
- american medical association6
- albert einstein coll med, bronx, ny 10467 usa.5
- american medical assocation5
- beckman res inst city hope, dept populat sci, duarte, ca usa.5
- citta salute & sci univ hosp, unit canc epidemiol, turin, italy.;ctr canc prevent cpo, turin, italy.5