Challenges in implementing the WHO-recommended package of care for advanced HIV disease in resource-constrained settings: A mixed-methods study - Temesgen Leka Lerango; Semalgn Leka Lerango; Mesfin Abebe; Tsion Mulat Tebeje; Habtamu Endashaw Hareru; Daniel Sisay; Getachew Assefa Zenebe; Yohannes Addisu; Biruk Bogale (PLoS ONE, 2026)