Urine antibiotic activity in patients presenting to hospitals in Laos: implications for worsening antibiotic resistance. - Khennavong, M; Davone, V; Vongsouvath, M; Phetsouvanh, R; Silisouk, J; Rattana, O; Mayxay, M; Castonguay-Vanier, J; Moore, C; Strobel, M; Newton, P (American journal of tropical medicine and hygiene, 2011)