Association of supine and upright blood pressure differences with head-up tilt test outcomes in children with vasovagal syncope - Khalilian, Mohammad Reza; Nasehi, Mohammad Mehdi; Farahmandi, Fargol; Farahmandi, Farzaneh; Tahouri, Tahmineh; Parhizgar, Parynaz (Frontiers in Pediatrics, 2025)