6DAY R. Local environments and older people's health: Di- mensions from a comparative qualitatives study in Scotland [J]. Health & place, 200834(2):299-312.
7GOENKA A, LIU L, NGUYEN M H. Infectious diseases and economic growth[J]. Journal of mathematical economics, 2014, 50(1):34-53.
8OCAMPO J M. Self-rated health: Importance of use in elder- ly adults[J]. Colombia m6diea, 2010,41(3):275-289.
9DIENER E, EMMONS R A. The independence of positive and negative affect[J]. J pers soc psychol, 1984,47(5): 105-117.
