Constructing causal models: critical issues.
D003710:Demography; D005163:Factor Analysis, Statistical; D006296:Health Services / Q000706:statistics & numerical data / Q000600:supply & distribution*; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D008962:Models, Theoretical; D009516:New Mexico; D010820:Physicians / Q000600:supply & distribution; D012107:Research Design; D012424:Rural Population; D012959:Socioeconomic Factors; D014505:Urban Population