title: Rare element telephone screening (RETS): a procedure for augmenting the number of black elderly in national samples.
mesh_terms: D001741:Black or African American; D000368:Aged; D003362:Cost-Benefit Analysis; D003625:Data Collection / Q000379:methods*; D004812:Epidemiologic Methods; D006801:Humans; D007407:Interviews as Topic; D008875:Middle Aged; D011897:Random Allocation; D013689:Telephone / Q000191:economics*