A multi-centre cohort study of the physical health of 5-year-old children conceived after intracytoplasmic sperm injection, in vitro fertilization and natural conception. by Bonduelle, M, Wennerholm, U, Loft, A, Tarlatzis, B, Peters, C, Henriet, S, Mau, C, Victorin-Cederquist, A, Van Steirteghem, A, Balaska, A, Emberson, JR, Sutcliffe, A