2 Basic Science Department, Dentistry College, University of Anbar, Al-Anbar, Iraq.
3 Teaching Assistant, MD, Department of Surgical Diseases, Faculty of Pediatrics, Samarkand State Medical Institute, Amir Temur Street 18, Samarkand, Uzbekistan.
4 College of Medicine, University of Al-Ameed, Karbala, Iraq.
5 College of Business Administration, Ajman University, Ajman, United Arab Emirates.
6 Medical Laboratories Techniques Department, Al-Mustaqbal University College, Hilla, 51001, Babylon, Iraq. abedalazeem799@gmail.com.
7 Medical Laboratory Analysis Department, College of Health Sciences, Cihan University of Sulaimaniya, Kurdistan Region, Iraq.
8 College of Veterinary Medicine, University of Sulaimani, Sulaimaniyah, Iraq.
Correction for 'Recent advances on the electrochemical and optical biosensing strategies for monitoring microRNA-21: a review' by Amir Abbas Esmaeilzadeh et al., Anal. Methods, 2022, 14, 4449-4459, https://doi.org/10.1039/D2AY01384C.