Assertion: placebo's treatment | /r/CapableOf | divulge via numbered sealed envelopes
Facets:
value: sequentially
type: MANNER
value: before injection
type: TEMPORAL
Source sentences:
text: Allocation was performed by research nurses in blocks of 30 at Walter Reed, Johns Hopkins, and Landstuhl, and in blocks of 10 at other sites, with treatment divulged via sequentially numbered sealed envelopes before injection.