Introduction to the special section: in search of a double paradigm.
Siegler
I C
IC
Behavioral Medical Research Center, Duke University Medical Center, Durham, North Carolina 27710, USA. is@bmrc.mc.duke.edu
Vitaliano
P P
PP
D000368:Aged; D000375:Aging / Q000523:psychology*; D001294:Attitude to Health; D005853:Geriatrics / Q000639:trends; D015438:Health Behavior; D006801:Humans; D011584:Psychology / Q000639:trends*