共 37 条
[2]
[Anonymous], 2012, OPEN VACCINE J
[4]
Bhandari B, 1990, Indian J Pediatr, V57, P197, DOI 10.1007/BF02722087
[8]
Characterizing selection bias using experimental data
[J].
ECONOMETRICA,
1998, 66 (05)
:1017-1098