Am J Respir Crit Care Med. 2001 May;163(6):1289-90. Comment on: Am J Respir Crit Care Med. 2001 May;163(6):1314-9. Heartbeats, hormones, and health: is variability the spice of life? Goldberger AL. Publication Types: Comment Editorial Review Review, Tutorial PMID: 11371381 [PubMed - indexed for MEDLINE]