Following screening, participants were randomly allocated to an order of conditions by selection of an opaque sealed envelope.
There won't be any slyly selective intake, or opaque selection of sponsors.
Others doubt that the online application will solve the longstanding issue of opaque selection at Italian universities.
The principle investigator (NvdR), who is not involved in the selection of patients, prepared the opaque, sealed envelopes, guaranteeing concealed randomisation.
Certainly, the urban elites of the late Qing took little comfort in being ruled by a series of toddlers.While the process of selection remains as opaque as ever, the Communist Party has made a serious attempt to institutionalise the handover of power.
"The selection of these managers seems incredibly opaque," Jeffrey Gundlach, an expert in mortgage-backed securities, told TPMmuckraker.
Adequate methods to prevent selection bias are, for example, centralized randomization and the use of opaque and sealed numbered envelopes.
Barton Swaim's indictment of opaque academic writing.
The PCS technique was adapted for investigation of opaque liquids.
