Distributionally Robust Transfer Learning with Structurally Missing Covariates, with Application to Cross-National Cardiac Arrest Prediction. - Siqi Li 004; Chuan Hong; Ziye Tian; Benjamin Sieu-Hon Leong; Koshi Nakagawa; Hideharu Tanaka; Sang Do Shin; Dai Quoc Khuong; Son Ngoc Do; Marcus Eng Hock Ong; Nan Liu 003; Molei Liu (CoRR, 2026)