UNICEF: Botswana country statistics. [http://www.unicef.org/infobycountry/botswana_statistics.html]
UNAIDS, NACA: UNGASS Botswana Country Report 2010: Reporting period 2008-2009.
Brocklehurst P, French R: The association between maternal HIV infection and perinatal outcome: a systematic review of the literature and meta-analysis. Br J Obstet Gynaecol. 1998, 105 (8): 836-848.
Bulterys M, Chao A, Munyemana S, Kurawige JB, Nawrocki P, Habimana P, Kageruka M, Mukantabana S, Mbarutso E, Dushimimana A, et al: Maternal human immunodeficiency virus 1 infection and intrauterine growth: a prospective cohort study in Butare, Rwanda. Pediatr Infect Dis J. 1994, 13 (2): 94-100.
Langston C, Lewis DE, Hammill HA, Popek EJ, Kozinetz CA, Kline MW, Hanson IC, Shearer WT: Excess intrauterine fetal demise associated with maternal human immunodeficiency virus infection. J Infect Dis. 1995, 172 (6): 1451-1460.
Leroy V, Ladner J, Nyiraziraje M, De Clercq A, Bazubagira A, Van de Perre P, Karita E, Dabis F: Effect of HIV-1 infection on pregnancy outcome in women in Kigali, Rwanda, 1992-1994. Pregnancy and HIV Study Group. AIDS. 1998, 12 (6): 643-650.
Rollins NC, Coovadia HM, Bland RM, Coutsoudis A, Bennish ML, Patel D, Newell ML: Pregnancy outcomes in HIV-infected and uninfected women in rural and urban South Africa. J Acquir Immune Defic Syndr. 2007, 44 (3): 321-328.
Ryder RW, Temmerman M: The effect of HIV-1 infection during pregnancy and the perinatal period on maternal and child health in Africa. AIDS. 1991, 5 (Suppl 1): S75-85.
Taha TE, Dallabetta GA, Canner JK, Chiphangwi JD, Liomba G, Hoover DR, Miotti PG: The effect of human immunodeficiency virus infection on birthweight, and infant and child mortality in urban Malawi. Int J Epidemiol. 1995, 24 (5): 1022-1029.
Temmerman M, Plummer FA, Mirza NB, Ndinya-Achola JO, Wamola IA, Nagelkerke N, Brunham RC, Piot P: Infection with HIV as a risk factor for adverse obstetrical outcome. AIDS. 1990, 4 (11): 1087-1093.
Habib NA, Daltveit AK, Bergsjo P, Shao J, Oneko O, Lie RT: Maternal HIV status and pregnancy outcomes in northeastern Tanzania: a registry-based study. BJOG. 2008, 115 (5): 616-624.
Habib NA, Dalveit AK, Mlay J, Oneko O, Shao J, Bergsjo P, Lie-Nielsen E, Lie RT: Birthweight and perinatal mortality among singletons and twins in north-eastern Tanzania. Scand J Public Health. 2008, 36 (7): 761-768.
Kumwenda NI, Hoover DR, Mofenson LM, Thigpen MC, Kafulafula G, Li Q, Mipando L, Nkanaunena K, Mebrahtu T, Bulterys M, Fowler MG, Taha TE: Extended antiretroviral prophylaxis to reduce breast-milk HIV-1 transmission. N Engl J Med. 2008, 359 (2): 119-129.
Shapiro RL, Hughes MD, Ogwu A, Kitch D, Lockman S, Moffat C, Makhema J, Moyo S, Thior I, McIntosh K, van Widenfelt E, Leidner J, Powis K, Asmelash A, Tumbare E, Zwerski S, Sharma U, Handelsman E, Mburu K, Jayeoba O, Moko E, Souda S, Lubega E, Akhtar M, Wester C, Tuomola R, Snowden W, Martinez-Tristani M, Mazhani L, Essex M: Antiretroviral regimens in pregnancy and breast-feeding in Botswana. N Engl J Med. 2010, 362 (24): 2282-2294.
De Vincenzi I, Kesho Bora Study Group: Triple antiretroviral compared with zidovudine and single-dose nevirapine prophylaxis during pregnancy and breastfeeding for prevention of mother-to-child transmission of HIV-1 (Kesho Bora study): a randomised controlled trial. Lancet Infect Dis. 2011, 11: 171-80.
Machado ES, Hofer CB, Costa TT, Nogueira SA, Oliveira RH, Abreu TF, Evangelista LA, Farias IF, Mercadante RT, Garcia MF, Neves RC, Costa VM, Lambert JS: Pregnancy outcome in women infected with HIV-1 receiving combination antiretroviral therapy before versus after conception. Sex Transm Infect. 2009, 85 (2): 82-87.
Ekouevi DK, Coffie PA, Becquet R, Tonwe-Gold B, Horo A, Thiebaut R, Leroy V, Blanche S, Dabis F, Abrams EJ: Antiretroviral therapy in pregnant women with advanced HIV disease and pregnancy outcomes in Abidjan, Cote d'Ivoire. AIDS. 2008, 22 (14): 1815-1820.
Townsend CL, Cortina-Borja M, Peckham CS, Tookey PA: Antiretroviral therapy and premature delivery in diagnosed HIV-infected women in the United Kingdom and Ireland. AIDS. 2007, 21 (8): 1019-1026.
Chen JY, Ribaudo H, Ogwu a, Lockman S, Syab P, Wester C, Tumbare E, Moffar H, Makhema J, Essex M, Shapiro RL: Risk factors for adverse pregnancy outcomes among HIV-infected and HIV-uninfected women in Gaborone and Molepolole, Botswana. Conference on Retroviruses and Opportunistic Infections. 2009, Montreal
United Nations Children's Fund and World Health Organization: Low birthweight: country, regional and global estimates. 2004, New York: UNICEF, 1-31.
Bonellie S, Chalmers J, Gray R, Greer I, Jarvis S, Williams C: Centile charts for birthweight for gestational age for Scottish singleton births. BMC Pregnancy Childbirth. 2008, 8: 5-
Briand N, Mandelbrot L, Le Chenadec J, Tubiana R, Teglas JP, Faye A, Dollfus C, Rouzioux C, Blanche S, Warszawski J: No relation between in-utero exposure to HAART and intrauterine growth retardation. AIDS. 2009, 23 (10): 1235-1243.
Ferdynus C, Quantin C, Abrahamowicz M, Platt R, Burguet A, Sagot P, Binquet C, Gouyon JB: Can birth weight standards based on healthy populations improve the identification of small-for-gestational-age newborns at risk of adverse neonatal outcomes?. Pediatrics. 2009, 123 (2): 723-730.
W.H.O: Neonatal and perinatal mortality: country, regional and global estimates. 2006, Geneva: World Health Organization, 75-
Oken E, Kleinman KP, Rich-Edwards J, Gillman MW: A nearly continuous measure of birth weight for gestational age using a United States national reference. BMC Pediatrics. 2003, 3 (6): 10-
de Onis M, Blossner M, Villar J: Levels and patterns of intrauterine growth retardation in developing countries. Eur J Clin Nutr. 1998, 52 (Suppl 1): S5-15.
Fok TF, So HK, Wong E, Ng PC, Chang A, Lau J, Chow CB, Lee WH: Updated gestational age specific birth weight, crown-heel length, and head circumference of Chinese newborns. Arch Dis Child Fetal Neonatal Ed. 2003, 88 (3): F229-236.
Kok JH, den Ouden AL, Verloove-Vanhorick SP, Brand R: Outcome of very preterm small for gestational age infants: the first nine years of life. Br J Obstet Gynaecol. 1998, 105 (2): 162-168.
Malloy MH: Size for gestational age at birth: impact on risk for sudden infant death and other causes of death, USA 2002. Arch Dis Child Fetal Neonatal Ed. 2007, 92 (6): F473-478.
Wennergren M, Wennergren G, Vilbergsson G: Obstetric characteristics and neonatal performance in a four-year small for gestational age population. Obstet Gynecol. 1988, 72 (4): 615-620.
Alshimmiri MM, Al-Saleh EA, Alsaeid K, Hammoud MS, Al-Harmi JA: Birthweight percentiles by gestational age in Kuwait. Arch Gynecol Obstet. 2004, 269 (2): 111-116.
Davidson S, Sokolover N, Erlich A, Litwin A, Linder N, Sirota L: New and improved Israeli reference of birth weight, birth length, and head circumference by gestationa age: a hospital-based study. Israeli Medical Association Journal. 2008, 10: 130-134.
Chapter 3. Splines. in Semiparametric regression for the Social Sciences. Edited by: Keele LJ. 2008, John Wiley and Sons
Wei Y, Pere A, Koenker R, He X: Quantile regression methods for reference growth charts. Stat Med. 2006, 25: 1369-1382.
Devlin T, Weeks B: Spline functions for logistic regression modeling. Proc Eleventh Annual SAS Users Group International. 1986, SAS Institute, Inc., 646-651.
Arbuckle TE, Wilkins R, Sherman GJ: Birth weight percentiles by gestational age in Canada. Obstet Gynecol. 1993, 81 (1): 39-48.
Rios JM, Tufino-Olivares E, Reza-Lopez S, Sanin LH, Levario-Carrillo M: Birthweight percentiles by gestational age and gender for children in the North of Mexico. Paediatr Perinat Epidemiol. 2008, 22 (2): 188-194.
Roberts CL, Lancaster PA: Australian national birthweight percentiles by gestational age. Med J Aust. 1999, 170 (3): 114-118.
Alexander GR, Himes JH, Kaufman RB, Mor J, Kogan M: A United States national reference for fetal growth. Obstet Gynecol. 1996, 87 (2): 163-168.
United Nations: World Population Prospects: The 2008 Revision. 2009, New York: Department of Economic and Social Affairs, Population Division
Blanc AK, Wardlaw T: Monitoring low birth weight: an evaluation of international estimates and an updated estimation procedure. Bull World Health Organ. 2005, 83 (3): 178-185.
Zhang J, Bowes WA: Birth-weight-for-gestational-age patterns by race, sex, and parity in the United States population. Obstet Gynecol. 1995, 86 (2): 200-208.
Kramer MS, Demissie K, Yang H, Platt RW, Sauve R, Liston R: The contribution of mild and moderate preterm birth to infant mortality. Fetal and Infant Health Study Group of the Canadian Perinatal Surveillance System. JAMA. 2000, 284 (7): 843-849.
McLean FH, Boyd ME, Usher RH, Kramer MS: Postterm infants: too big or too small?. Am J Obstet Gynecol. 1991, 164 (2): 619-624.
Wilcox AJ, Skjaerven R: Birth weight and perinatal mortality: the effect of gestational age. Am J Public Health. 1992, 82 (3): 378-382.
Kramer MS, McLean FH, Boyd ME, Usher RH: The validity of gestational age estimation by menstrual dating in term, preterm, and postterm gestations. JAMA. 1988, 260 (22): 3306-3308.
Wilcox AJ: On the importance--and the unimportance--of birthweight. Int J Epidemiol. 2001, 30 (6): 1233-1241.
Skjaerven R, Gjessing HK, Bakketeig LS: Birthweight by gestational age in Norway. Acta Obstet Gynecol Scand. 2000, 79 (6): 440-449.
Kallen B: A birth weight for gestational age standard based on data in the Swedish Medical Birth Registry, 1985-1989. Eur J Epidemiol. 1995, 11 (5): 601-606.
Joseph KS, Kramer MS, Allen AC, Mery LS, Platt RW, Wen SW: Implausible birth weight for gestational age. Am J Epidemiol. 2001, 153 (2): 110-113.
Platt RW, Abrahamowicz M, Kramer MS, Joseph KS, Mery L, Blondel B, Breart G, Wen SW: Detecting and eliminating erroneous gestational ages: a normal mixture model. Stat Med. 2001, 20 (23): 3491-3503.
HIV prevalence estimates--United States, 2006. MMWR Morb Mortal Wkly Rep. 2008, 57 (39): 1073-1076.