Challenges faced by adolescents and lung function technicians in Anuradhapura district, Sri Lanka, during spirometry: a qualitative study. - Perera, Devanji; Nayakarathne, Gajaba; Chandrasiri, Parami; Ananda, Kasuni; Nuwangi, Hasara; Rajapakse, Shashanka (International Health (1876-3413), 2026)