5Darey AE, Hancock LE, Ware FJ. A descriptive study of noise in the neonatal intermive calt ,unit. Ambient Ievels and percep- tions of contributing factors [ J ]. Adv Neonatal Care, 2008,8 (3) :165 - 175.
8Van Kempen EE, Kruize H, Boshuizen HC, et al. The asso- ciation between noise exposure and blood pressure and is- chemic heart disease a meta - analysis [ J ]. Envirormental Health Perspectives,2002,110 (3) : 307.