1. Spontaneous preterm delivery in primiparous women at low risk in Denmark: population based study;Langhoff-Roos;BMJ,2006
2. Epidemiology of preterm birth;Tucker;BMJ,2004
3. The Vermont-Oxford Trials Network: 2004 Annual report;Horbar,2005
4. Influencia de los cuidados intensivos neonatales en la mortalidad del síndrome de dificultad respiratoria idiopática;Valls i Soler;An Esp Pediatr,1975
5. The small-for-date infant. II. Neurological and intellectual sequelae;Fitzhardinge;Pediatrics,1972