There are also studies that found economic and social factors. (Socio-economic status factors) that are associated with disease, such factors include the level of education (Minh et al., 2006 & Conen et al., 2009 & Shiue et al., 2013 & Harshfield et al. , 2015 & Baek et al., 2015) career (Minh et al., 2006), economic status (Minh et al., 2006 & Harshfield et al., 2015), income and social status (Baek et al., 2015. ) as well as a residential area (Harshfield et al., 2015 & elephant intelligence Excellence, 2557).
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