Kritsana Jongsongsrerm. (1993) Relationship between pre-pregnancy nutritional status, average weight gain during pregnancy and preterm delivery in singleton pregnancy : Siriraj Hospital. Mahidol University,:ม.ป.ท.Kritsana Jongsongsrerm. 1993. Relationship between pre-pregnancy nutritional status, average weight gain during pregnancy and preterm delivery in singleton pregnancy : Siriraj Hospital. ม.ป.ท.:Mahidol University,;Kritsana Jongsongsrerm. Relationship between pre-pregnancy nutritional status, average weight gain during pregnancy and preterm delivery in singleton pregnancy : Siriraj Hospital. ม.ป.ท.:Mahidol University, 1993. Print.