共 29 条
[1]
ACOG Committee Obstetric Practice, 2002, Obstet Gynecol, V99, P171
[2]
[Anonymous], 2001, OBSTET GYNECOL, V98, P525
[5]
Centers for Disease Control and Prevention (CDC), 2009, PREGN NUTR SURV TABL
[6]
Corbin J., 2015, Basics of qualitative research: Techniques and procedures for developing grounded theory, V4th ed, DOI DOI 10.4135/9781452230153