TY  - RPRT
TI  - Heart rate variability: recent developments.
AU  - Juha S Perkiömäki
PY  - 2002
DO  - 10.1111/j.1542-474x.2002.tb00146.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12049677/
ID  - 12049677
ER  -