Inhibin B and anti-Mullerian hormone as markers of persistent spermatogenesis in men with non-obstructive azoospermia: a meta-analysis of diagnostic accuracy studies - Toulis, K A; Iliadou, P K; Venetis, C A; Tsametis, C; Tarlatzis, B C; Papadimas, I; Goulis, D G (Hum Reprod Update, 2010)