Effectiveness of an integrated agriculture, nutrition-specific, and nutrition-sensitive program on child growth in Western Kenya: a cluster-randomized controlled trial by Wegmüller, R, Musau, K, Vergari, L, Custer, E, Anyango, H, Donkor, WES, Kiprotich, M, Siegal, K, Petry, N, Wirth, JP, Lewycka, S, Woodruff, BA, Rohner, F