Rodriguez A, Garcia-Esteban R, Basterretxea M, Lertxundi A, Rodriguez‐Bernal C, Iniguez C, Rodriguez‐Dehli C, Tardon A, Espada M, Sunyer J, Morales E. Associations of maternal circulating 25-hydroxyvitamin D3 concentration with pregnancy and birth outcomes. BJOG. 2015 Nov;122(12):1695-704. doi: 10.1111/1471-0528.13074
Diette GB, Dalal AA, D'Souza AO, Lunacsek O, Nagar SP. Treatment patterns of chronic obstructive pulmonary disease in employed adults in the United States. Int J Chron Obstruct Pulmon Dis. 2015 Feb 24;10:415-22.