Exact(17)
After consenting, study participants were instructed to complete the migraine survey within 24 h of resolution of their next migraine attack, if such an attack occurred within 7 days of receipt of the study invitation.
Fresh placental tissue samples from the MHP cohort were obtained from consenting study participants at delivery and immediately frozen at −80 degrees Celsius (°C).
Approximately 5 mL of fasting venous blood specimen was collected from each consenting study participant.
Self-administered and anonymous questionnaire was distributed to 220 eligible consenting study participants.
Consenting study members were linked to the National Health Service mortality records, from which a death certificate was located.
Consenting study members (75 936 (89.1%)) were linked to National Health Service mortality data up to February 2008.
Similar(43)
Three hundred and ninety eight consented study subjects were recruited for the study.
After providing informed written consent, study subjects were asked to complete a brief questionnaire and have blood drawn.
All mothers who consented in the cohort study were eligible for the consent study and were contacted.
*Adjusted for age, education, time interval between the original study and consent study.
This study was approved by the Northwestern University Institutional Review Board with a waiver of consent (study number: STU00013313).
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