Authors: A J Wakefield; A M Sawyerr; A P Dhillon; R M Pittilo; P M Rowles; A A Lewis; R E Pounder Journal: Lancet Date: 1989-11-04 Impact factor: 79.321
Authors: J Brynskov; L Freund; S N Rasmussen; K Lauritsen; O S de Muckadell; N Williams; A S MacDonald; R Tanton; F Molina; M C Campanini Journal: N Engl J Med Date: 1989-09-28 Impact factor: 91.245