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APA Citation
Corrado, J., Halpin, S., Preston, N., Whiteside, D., Tarrant, R., Davison, J., Simms, A. D., O'Connor, R. J., Casson, A., & Sivan, M. (2022). hEART rate variability biofeedback for long COVID symptoms (HEARTLOC): protocol for a feasibility study. BMJ open, 12(11), . http://access.bl.uk/ark:/81055/vdc_100169753454.0x000032