Wnt4, Wnt6 and β-catenin expression in human placental tissue – is there a link with first trimester miscarriage? Results from a pilot study oleh Elpiniki Chronopoulou, Vasiliki Koika, Konstantinos Tsiveriotis, Konstantinos Stefanidis, Sotirios Kalogeropoulos, Neoklis Georgopoulos, George Adonakis, Apostolos Kaponis