Diagnostic yield and safety of needle-based COnfocaL LAser endomicroscopy and ultrasound-guided pleural BiOpsy in diagnosing patients with unknown pleuRAl effusion: a protocol for a mulTIcenter, randomized cONtrolled trial (COLLABORATION-II). - Zheng Z; Ye S; Liu X; Xiao K; Deng M; Tong R; Porcel JM; Wang T; Hou G (Respiratory research, 2026)