Association of Duration of Symptoms and Secondary Signs in Ultrasound for Pediatric Appendicitis. Issue 9 (September 2016) - Partain, Kristin N.; Patel, Adarsh U.; Travers, Curtis; McCracken, Courtney; Loewen, Jonathan; Braithwaite, Kiery; Heiss, Kurt F.; Raval, Mehul V.