External quality assessment for yaws elimination in low- and middle-income countries using plasmid-based proficiency test items. - Mueller, Claudia; Tchatchouang, Serges; Basing, Laud Anthony; Ngazoa-Kakou, Solange; Hugues, Kouadio Aboh; Handley, Becca Louise; Beiras, Camila G.; Amanor, Ivy; Ndzomo, Philippe; Bakheit, Mohammed A.; Becherer, Lisa; Tabah, Earnest Njih; et al. (PLoS Neglected Tropical Diseases, 2026)