Haemophilus ducreyi as a cause of skin ulcers in children from a yaws-endemic area of Papua New Guinea: a prospective cohort study oleh Dr. Oriol Mitjà, MD, Prof. Sheila A Lukehart, PhD, Gideon Pokowas, HEO, Penias Moses, HEO, August Kapa, BSc, Charmie Godornes, BSc, Jennifer Robson, MD, Sarah Cherian, MD, Wendy Houinei, HEO, Walter Kazadi, MD, Prof. Peter Siba, PhD, Elisa de Lazzari, MSc, Quique Bassat, MD