A feature-efficient dual-task machine learning framework for predicting bone mineral density and osteoporosis stratification in resource-constrained environments - Alina Maryum; Arslan Shaukat; Ehsan Yousaf; Ayesha Haque; Shazia Yusuf; Saif ul Haque; Humaira Ali; Soyiba Jawed; Muhammad Usman Akram (PLoS ONE, 2026)