“…While some investigations have found that household income 13 and a mother's education level 7,14,15 exert an influence on the occurrence of TDI in preschoolers, others have not found such associations (Table 1). 1,5,6,11,12,13,14,15,16,17,18,19,20 declaration of interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”