Computes RR interval from heart rate.
See also
BDS-Findings Functions that returns a vector:
compute_bmi()
,
compute_bsa()
,
compute_egfr()
,
compute_framingham()
,
compute_map()
,
compute_qtc()
,
compute_qual_imputation()
,
compute_qual_imputation_dec()
,
compute_scale()