Vitamin D Status

• Ulster University, Human Intervention Studies Unit, Coleraine, Co. Londonderry — Coleraine, United Kingdom

• Hospices Civils de Lyon - Pôle IMER — Lyon, France

• Department of Obstetrics and Gynecology, Faculty of Medicine, Khonkaen University — Khon Kaen, Changwat Khon Kaen, Thailand

• City, University of London — London, United Kingdom

• AB shetty Institute of dental sciences — Mangaluru, Karnataka, India

• Kätilöopisto Maternity Hospital — Helsinki, Finland

• Department of Nutrition, Exercise and Sports — Frederiksberg, Denmark

Not specified

• Human Intervention Studies Unit (HISU), University of Ulster — Coleraine, Londonderry, United Kingdom

• Sheffield Children's NHS Foundation Trust — Sheffield, Sheffield (South Yorkshire District), United Kingdom