Apfel, CC; Korttila, K; Abdalla, M; Biedler, A; Kranke, P; Pocock, SJ; Roewer, N; (2003) An international multicenter protocol to assess the single and combined benefits of antiernetic interventions in a controlled clinical trial of a 2x2x2x2x2x2 factorial design (IMPACT). Controlled clinical trials, 24 (6). pp. 736-751. ISSN 0197-2456 DOI: https://doi.org/10.1016/s0197-2456(03)00107-7 Full text not available from this repository.