“…9,10,39-49 The outcomes were not clearly defined in 29 studies. 14, [16][17][18]21,22,26,27,39,[49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67] Thirty-three studies did not define the exposure variables 7,8,14,15,18,22,23,34,40,41,[50][51][52][53][54][56][57][58][59][60][61][62][63][64][65][66]…”