Evaluation of a Smartphone-Based Weight Loss Intervention with Telephone Support for Merchant Women With Obesity in Côte d'Ivoire: Protocol for a Randomized Controlled Trial - Rui Usui; Maki Aomori; Shogo Kanamori; Setsuko Watabe; Bi Tra Jamal Sehi; Kei Kawano; Yuka Kanoya (JMIR Research Protocols)