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. 2013 Oct 11;10(10):4907–4924. doi: 10.3390/ijerph10104907
Item Number General Population Norms (n = 25,352) Managerial and Professional Norms
(n = 5,947)
Indian Call Center
(n = 401)
14 3.44 0.33 3.31 1.75 3.67 1.61