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"A back-of-the-envelope calculation..
Practice back-of-the-envelope calculations.
Both LF and the participants were unaware of their assignment, until opening the envelope, thus ensuring adequate allocation concealment.
A system of sealed envelopes was used for assignment of the eligible neonates.
Science on the Back of the Envelope.
Back of the Envelope Physics. 3 Units.
Wagner signed the back of the envelope.
Cut the corner of the envelope.
Cut off most of the envelope.
Standards for assignment of the "p.g.a".
For both phases, individual envelopes were prepared with a sequential serial number on the outside of a sealed envelope (separate set of ordered envelopes for each VDC-Gestational Age stratum in both phases and the treatment assignment for that participant was printed on a piece of paper inside the envelope).
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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