Potential health risks of exposure to noise from personal music players and mobile phones including a music playing function

A similar sampling technique – based on district and provincial population size – was used for surveys of providers: employers, health care facilities, traditional healers, NGOs, and pharmacies. Due to the size of each province and district, random selection was used. Donors and insurance company surveys were implemented only in Lusaka. In order to estimate health expenditure estimates by both larger and smaller employers, the employer sample was divided into two groups based on the number of employees working at the company: employers with 20 or more employees and those with 19 or fewer. The survey also targeted a proportionate.

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