[1] Mid Cheshire Hosp NHS FT, Crewe CW1 4QJ, England
[2] Liverpool Womens NHS Fdn Trust, Hewitt Fertil Ctr, Liverpool L8 7SS, England
[3] Betsi Cadwaladr Univ Hlth Board, Wrexham LL13 7TD, Wales
[4] Bangor Univ, Bangor LL57 2DG, Wales
[5] Mysore Med Coll & Res Inst, Mysore, Karnataka, India
[6] Wrexham Maelor Hosp, Wrexham LL13 7TD, Wales
[7] Betsi Cadwaladr Univ Hlth Board, Womens Serv, Bangor, North Wales, Wales
[8] Glyndwr Univ, Wrexham LL11 2AW, Wales