Authors: M Zeidler; G E Stewart; C R Barraclough; D E Bateman; D Bates; D J Burn; A C Colchester; W Durward; N A Fletcher; S A Hawkins; J M Mackenzie; R G Will Journal: Lancet Date: 1997-09-27 Impact factor: 79.321
Authors: M Otto; J Wiltfang; E Schütz; I Zerr; A Otto; A Pfahlberg; O Gefeller; M Uhr; A Giese; T Weber; H A Kretzschmar; S Poser Journal: BMJ Date: 1998-02-21