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All relevant documentation and envelopes will be delivered to the CI and secured in a locked cabinet, in a locked office.
Allocations will be sealed in opaque and consecutively numbered envelopes kept in a locked location.
Stratified allocations will be sealed in opaque and consecutively numbered envelopes kept in a locked location.
The envelopes were stored in a locked safe.
These were concealed in opaque envelopes and stored in a locked central location.
Envelopes are stored in a locked cabinet not accessible to the study statistician or Investigators.
The envelopes were stored in a locked closet, supervised by the Study Manager.
A container with the sequentially numbered, sealed envelopes is stored in a locked cupboard, which only the investigator(s) can open.
In order to minimize the chance of bias we used [ 27] a) Opaque, sealed and serial numbered envelopes b) opened sequentially and only after the participant's name and further details were written on the envelope c) kept them in a locked and secure place.
The envelopes will be kept in a locked location.
A computer generated list was used to produce envelopes that were stored in a locked room.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com