Information on the study was provided to parents of selected young children via school principals and teachers.
A telephone survey of parents of selected children was carried out between October 2003 and September 2004.
The school coordinators visited parents of selected peer educators to explain the programme and to obtain a signed consent form allowing their daughters/sons to participate.
In a second stage of recruitment of controls, a school nurse or the first author telephoned the parents of selected children and asked whether the families were willing to participate in the study.
Agar dilution method was used for determining MICs of glycopeptides and population analysis profile was performed for detecting frequency of heterogeneous resistance for the parents of selected strains on BHA-4.
The selected nodes are called the "children" of the selecting node, which is called the "parent" of its selected children.
Contributors of a selected animal can be found by an exhaustive search of selected animals that replace any excluded parent of the selected animal.
From each selected individual, a number of "gametes" are formed, which are lists of alleles inherited from either parent of the selected individual.
Parents or guardians of selected children were explained the purpose of the research and their written consent for participation was obtained before collecting data.
With approval by the school administration committee, a detailed cover letter from the researcher, a consent form, and a set of questionnaires (with a return envelope) were sent to the parents or guardians of selected children.
