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  1. 401
    “…In contrast, assessor blinding (difference = 0.06; 95% CI: -0.06 to 0.18), caregiver blinding (difference = 0.02; 95% CI: -0.04 to 0.09), principal-investigator blinding (difference = − 0.02; 95% CI: -0.10 to 0.06), describing a trial as “double-blind” (difference = 0.09; 95% CI: -0.05 to 0.22), and lack of an appropriate method of blinding (difference = 0.06; 95% CI: -0.06 to 0.18) were not associated with over- or underestimated treatment effect size. …”
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    Influence of blinding on treatment effect size estimate in randomized controlled trials of oral health interventions
  2. 402
    “…To analyze the data, the principal investigator (IS) used open, axial, and selective coding techniques. …”
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    Use of Physical Activity Monitoring Devices by Families in Rural Communities: Qualitative Approach
  3. 403
    “…Studies with assembled clinical translational research scholar mentorship team will allow the principal investigator to develop an independent career with laboratory focused on contributing to improved patient outcomes, translating successful pericyte-targeted results to patient trials.…”
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    2313 Characterization of the host pericyte role in glioblastoma angiogenesis
  4. 404
    “…The data was checked and cleaned by principal investigator on daily basis during data collection for completeness, consistencies, then coded, entered and analyzed using SPSS version 21 software. …”
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    Determinants of delayed diagnosis among pediatric cancer patients from Ayder Comprehensive Specialized Hospital, Mekelle, Northern Ethiopia
  5. 405
    “…TRIAL REGISTRATION: The study was retrospectively registered at Chinese Clinical Trial Registry; the registration number is ChiCTR-IPD-17011145, principal investigator: D.Y. Q., date of registration: April 13, 2017.…”
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    Effects of different doses of magnesium sulfate on pneumoperitoneum-related hemodynamic changes in patients undergoing gastrointestinal laparoscopy: a randomized, double-blind, controlled trial
  6. 406
    “….: H-18018325). The principal investigator obtains informed consent from all participants. …”
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    Health promotion and cardiovascular risk reduction in people with spinal cord injury: physical activity, healthy diet and maintenance after discharge— protocol for a prospective national cohort study and a preintervention- postintervention study
  7. 407
    “…ChiCTR1900025718); principal investigator: Z.L.H.; date of registration: September 6, 2019.…”
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    GlideScope® versus C-MAC®(D) videolaryngoscope versus Macintosh laryngoscope for double lumen endotracheal intubation in patients with predicted normal airways: a randomized, controlled, prospective trial
  8. 408
    “…Trained evaluators performing the initial assessment with the UNIP (index test) were blinded to the study, and the pain specialist physician (reference standard) was blinded to the outcome of the initial UNIP evaluation and the BPISF; data from the initial UNIP assessment were not gathered by the principal investigator until all other study procedures were completed. …”
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    Chronic pain diagnosis in refugee torture survivors: A prospective, blinded diagnostic accuracy study
  9. 409
    “…Both intervention protocols will last for 3 months. The principal investigator will conduct an educational session at baseline for all participants. …”
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    A mobile app using therapeutic exercise and education for self-management in patients with hand rheumatoid arthritis: a randomized controlled trial protocol
  10. 410
    “…METHOD: This pilot study included all 21 critically ill COVID-19 patients hospitalized in May 2020 in the ICU of North Suburban Medical Center, Thornton, Colorado, in whose care the principal investigator (C.A.) was involved. We measured patients’ serum vitamin C and vitamin D levels, and standard risk factors like age, BMI, HbA1c, and smoking status. …”
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    Serum Levels of Vitamin C and Vitamin D in a Cohort of Critically Ill COVID-19 Patients of a North American Community Hospital Intensive Care Unit in May 2020: A Pilot Study()
  11. 411
    “…TRIAL REGISTRATION: The study was registered in the Chinese Clinical Trial Registry (ChiCTR2000031134, principal investigator: Yao Lu, date of registration: 2020-3-22).…”
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    The Effect of Ultrasound-Guided Erector Spinae Plane Block Combined with Dexmedetomidine on Postoperative Analgesia in Patients Undergoing Modified Radical Mastectomy: A Randomized Controlled Trial
  12. 412
    “…The pediatric rheumatologists referred 85% of the JIA group, and the study’s principal investigator, a nurse scientist, referred 95% of the control group. …”
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    Best practices for recruitment of adolescents for biobanking and precision health research: a retrospective analysis comparing juvenile idiopathic arthritis cases with healthy controls
  13. 413
    “…TRIAL REGISTRATION: Chinese Clinical Trial Registry: ChicTR1900028424 (principal investigator: Yue Wu; date of registration: 21 December 2019). …”
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    Predictive Value of Contrast-Enhanced Ultrasound in Chemical Lumbar Sympathectomy for End-Stage Arteriosclerosis Obliterans of the Lower Extremities
  14. 414
    “…TRIAL REGISTRATION: This study is registered on ClinicalTrials.gov (NCT04857450; principal investigator: Mostafa Mohammed Elsaid Elhamamsy; registration date: 23/04/ 2021).…”
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    Effects of adding low-dose ketamine to etomidate on serum cortisol levels in critically ill cardiac patients: a randomized clinical trial
  15. 415
    “…TRIAL REGISTRATION: Registered with clinicaltrials.gov (NCT #NCT03314272, Principal investigator Roland Kaddoum, date of registration: 19/10/2017).…”
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    Automated versus conventional perioperative glycemic control in adult diabetic patients undergoing open heart surgery
  16. 416
    “…Registered by: Margaret-Ann Tait. Principal Investigator: Madeleine King. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11136-022-03222-y.…”
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    Health-related quality of life of Australians during the 2020 COVID-19 pandemic: a comparison with pre-pandemic data and factors associated with poor outcomes
  17. 417
    “…Each article will be screened by at least two co-authors independently followed by data extraction of the included articles by one co-author and a review by the principal investigator. RESULTS: We will present the results both narratively and with visual aids (e.g., flowcharts, tables, conceptual maps). …”
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    Identifying performance factors of long-term care facilities in the context of the COVID-19 pandemic: a scoping review protocol
  18. 418
    “…Two independent reviewers will conduct the literature screening and relevance assessment, and disagreements will be resolved through discussion. The principal investigator will conduct data extraction and synthesis, and a second reviewer will check the sample of extracted data for consistency and accuracy. …”
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    Facilitators, barriers and strategies for health-system guidance implementation: a critical interpretive synthesis protocol
  19. 419
    “…TRIAL REGISTRATION: This study is registered on chictr.org.cn (ChiCTR-ROC-17013258); principal investigator: Jianling Xu; registration date: 06/11/2017). …”
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    The value of multiparameter combinations for predicting difficult airways by ultrasound
  20. 420
    “…METHODS: Two rounds of focus group discussions with T2DM patients were conducted. The principal investigator of the study and a research assistant compiled a list of volunteer patients with names and contact information and selected participants based on their medical information. …”
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    Challenges of Type 2 Diabetes Mellitus Management From the Perspective of Patients: Conventional Content Analysis
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