共 14 条
[1]
[Anonymous], 1970, CLASSIFICATION OCCUP
[2]
BUTLER NR, 1969, 2ND REP 1958 BRIT PE
[3]
BUTLER NR, 1963, 1ST REP 1958 BRIT PE
[4]
CHAMBERLAIN R, 1975, BRIT BIRTHS 1970
[5]
Danforth D N, 1965, Clin Obstet Gynecol, V8, P854, DOI 10.1097/00003081-196512000-00005
[7]
FREETH DH, 1950, BRIT MEDICAL J, V2, P18
[8]
HON EH, 1963, OBSTET GYNECOL, V22, P137
[9]
Hon EH, 1968, ATLAS FETAL HEART RA