“…Of the 15 studies, five studies were occupational exposure [11,12,16,17,19], and 10 studies were residential exposure [9, 10, 13-15, 18, 20, 21] including five electronic blanket exposure [9,14,20,21]. Five studies provided data on ER status [9,12,13,17,19], seven on the premenopausal status [9,[11][12][13][14]19] and eight on postmenopausal status [9, 11-14, 16, 19]. Subgroup analyses were based on these data above.…”