[1] King Abdullah Int Med Res Ctr, Riyadh 11426, Saudi Arabia
[2] Univ Melbourne, Royal Womens Hosp, Dept Obstet & Gynaecol, Parkville, Vic 3052, Australia
[3] Univ Melbourne, Royal Womens Hosp, Dept Perinatal Med, Pregnancy Res Ctr, Parkville, Vic 3052, Australia
[4] King Saud bin Abdulaziz Univ Hlth Sci, Coll Med, Riyadh 11481, Saudi Arabia
[5] King Abdulaziz City Sci & Technol, Riyadh 11442, Saudi Arabia
[6] King Saud Bin Abdulaziz Univ Hlth Sci, Coll Sci & Hlth Profess, Riyadh 11481, Saudi Arabia