"approval of reference" is a correct and usable phrase in written English.
You can use it when discussing a recommendation or endorsement given by someone. For example: "After careful consideration of the candidate's qualifications and experience, we are pleased to provide our approval of reference for their application to our company."
The Research Ethics Committee of the London School of Hygiene & Tropical Medicine in the United Kingdom provided ethics approval (reference number 5448).
Prof. Luis Rodrigo, MD, PhD, has contributed in the conception and revision of the discussion, selection and approval of references used, and supervision-approval of the final manuscript.
All the research procedures have received the approval of Cameroon National Ethics Committee reference number 181/CNE/SE/2011 signed by Pr Lazare Kaptue, the president of the committee.
The study was performed with the approval of the reference Ethics Committee for Clinical Research of the La Paz University Hospital (Madrid), and this approval was accepted by the authorities of the other participating centers.
In the Research ranks, reappointments, which are not limited in number of terms, do not require faculty or committee approval or letters of reference.
The device approval process, use of reference and control materials, and ongoing proficiency assessments require relatively large quantities of clinical samples in order to assure test performance is adequate and maintained over time.
The Medical Ethics Committee of the Leiden University Medical Centre had granted ethical approval of this study (reference number NV/CME 09/081).
Further experiments at the Mater Medical Research Institute were performed with the approval of the Mater Health Services Human Research Ethics Committee (Reference: 1915A).
The samples were obtained following informed consent and with the approval of the Universidade Federal de Minas Gerais Ethics Committee (reference number 266/11).
Following the Institutional Ethics Committee approval of Teikyo University, Tokyo, Japan (reference number 13 252), we retrospectively analyzed data from patients who underwent off-pump CABG at Teikyo University Chiba Medical Center (Chiba, Japan) from April 2009 to March 2014.
The study protocol was examined by the Ethics Commission of the University of Erlangen-Nuremberg (Date of approval: 10.7.2008/ Reference Number: 3232).
