Effectiveness of the User-Centered “Healthcare CEO” App for Patients With Type 1 Diabetes Transitioning From Adolescence to Early Adulthood: Protocol for a Randomized Controlled Trial - Yueh-Tao Chiang; Hsing-Yi Yu; Pei-Kwei Tsay; Chi-Wen Chen; Chi-Wen Chang; Chien-Lung Hsu; Fu-Sung Lo; Philip Moons (JMIR Research Protocols)