Mediating role of sleep quality in the relationship between smartphone addiction and academic performance among nursing students in Morocco: a cross-sectional study. - Haddaouy, Abdelhadi El; Blaak, Hicham; Khalladi, Jaouad El; Essaidi, Meryem; Iziki, Hayat; Es-Sabir, Fatima; Omari, Fatima El (BMC Nursing, 2025)