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Non-random recruitment procedures limited the external validity in all studies.
Participation rates for controls could not be calculated because the recruitment procedure involved population-based, random digit dialing for which we did not have a roster for the population controls, and therefore no denominator data.
Details of the recruitment procedure have been described elsewhere [16, 17].
The recruitment procedure has been previously detailed [40].
Figure 1 illustrates the recruitment procedure.
Random recruitment of volunteers from the community was not feasible.
Recruitment procedure is described by Molina-Vila et al. (4).
Convenience sampling [ 16] was used for the recruitment procedure.
The figure below illustrates the patient recruitment procedure (Fig. 1).
The recruitment procedure is shown in Figure 1.
The recruitment procedure was organised in two steps.
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