Nocturnal Heart Rate Variability Spectrum Characterization in Preschool Children With Asthmatic Symptoms. - Javier Milagro; Eduardo Gil; Jesús Lázaro 002; Ville-Pekka Seppä; L. Pekka Malmberg; Anna S. Pelkonen; Anne Kotaniemi-Syrjanen; Mika J. Makela; Jari Viik; Raquel Bailón (IEEE J. Biomed. Health Informatics, 2018)