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2. Childbirth in Developing Countries,1993
3. The Captured Womb: A History of the Medical Care of Pregnant Women;Oakley,1984
4. The relationship of social networks and social support to morbidity and mortality;Berkman,1985
5. Psychosocial factors, life crisis and the prognosis of pregnancy;Nuckolls;Am. J. Epidemiol.,1972