<qa>  What is the birth weight of all preterm infants born in 2011 and 2014?All preterm infants born during year 2011 and year 2014, before 32 weeks of gestational age GA or with a birth weight below 1500 g, hospitalized within the first 48 hours of life in the tertiary care unit at Croix-Rousse Hospital, Lyon, France and discharged home from the unit. 