References:

1. Predicting Extubation Outcomes—A Model Incorporating Heart Rate Characteristics Index.  Nitin Goel, Mallinath Chakraborty, William John Watkins, Sujoy Banerjee.  J Pediatr 2018.
2. Predicting extubation readiness and success using Heart Rate Characteristics Index in Preterm Infants – Re-Analysis of a Randomised Controlled Trial.  Mallinath Chakraborty, William John Watkins, Katherine Tansey, William E. King, Sujoy Banerjee.  Manuscript in process.