[1] Uppsala Univ, Dept Ophthalmol, Uppsala, Sweden
[2] Karolinska Univ Hosp Huddinge, Dept Pediat, Stockholm, Sweden
[3] Uppsala Univ, Dept Pediat, Uppsala, Sweden
[4] Lund Univ, Dept Pediat, S-22100 Lund, Sweden
[5] Sahlgrens Univ Hosp, Dept Obstet & Gynecol, Gothenburg, Sweden
[6] Univ Gothenburg, Sahlgrenska Acad, Dept Ophthalmol, Inst Neurosci & Physiol, Gothenburg, Sweden
[7] Umea Univ Hosp, Dept Clin Sci Obstet & Gynecol, S-90185 Umea, Sweden
[8] Uppsala Univ, Dept Ophthalmol, Uppsala, Sweden
[9] Linkoping Univ, Dept Ophthalmol, S-58183 Linkoping, Sweden
[10] Linkoping Univ, Dept Obstet & Gynecol, S-58183 Linkoping, Sweden
[11] Umea Univ, Dept Ophthalmol, S-90187 Umea, Sweden
[12] Lund Univ, Ctr Reprod Epidemiol, S-22100 Lund, Sweden
[13] Astrid Lindgren Childrens Hosp, Dept Pediat, Karolinska Inst, Stockholm, Sweden
[14] Bodo Cent Hosp, Dept Pathol, Bodo, Norway
[15] Univ Orebro, Dept Pediat, Orebro, Sweden
[16] Lund Univ, Dept Hlth Sci, S-22100 Lund, Sweden
[17] Lund Univ, Dept Obstet & Gynecol, S-22100 Lund, Sweden
[18] Lund Univ, Dept Med Eth, S-22100 Lund, Sweden
[19] Uppsala Univ, Dept Obstet & Gynecol, Uppsala, Sweden
[20] Karolinska Inst, Dept Clin Sci Intervent & Technol, Stockholm, Sweden
[21] Karolinska Univ Hosp, Dept Pediat, Stockholm, Sweden
[22] Linkoping Univ, Dept Pediat, S-58183 Linkoping, Sweden
[23] Univ Orebro, Dept Obstet & Gynecol, Orebro, Sweden
[24] Umea Univ Hosp, Dept Pediat, Umea, Sweden
[25] Karolinska Univ Hosp Solna, Dept Obstet & Gynecol, Stockholm, Sweden
[26] Sahlgrens Univ Hosp, Dept Pediat, Gothenburg, Sweden
[27] Lund Univ, Dept Psychol, S-22100 Lund, Sweden
[28] Lund Univ, Dept Ophthalmol, S-22100 Lund, Sweden
[29] Karolinska Univ, St Erik Eye Hosp, Stockholm, Sweden
[30] Karolinska Univ Hosp Huddinge, Dept Obstet & Gynecol, Stockholm, Sweden