Assessment of ultrasound morbidity indicators of schistosomiasis in the context of large-scale programs illustrated with experiences from Malian children - Koukounari,A; Sacko,M; Keita,AD; Gabrielli,AF; Landoure,A; Dembele,R; Clements,AC; Whawell,S; Donnelly,CA; Fenwick,A; Traore,M; Webster,JP (AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE, 2006)