Heart rate variability responses determined by photoplethysmography in people with spinal cord injury. - Luiz Henrique Rufino Batista; Wagner Jorge Ribeiro Domingues; Anselmo de Athayde Costa e Silva; Kathya Augusta Thomé Lopes; Minerva Leopoldina de Castro Amorim; Mateus Rossato (Biomed. Signal Process. Control., 2021)