Vessels from Japan, Peru, and the USA conducted four sequential surveys designed to estimate the biomass density and demography of Antarctic krill in the vicinity of the South Shetland Islands between late December 1999 and early March 2000.
We conducted two sequential surveys of 5,216 residents in non-devastated and devastated areas in September-October 2008 and April-May 2009.
NPS have also been used to derive age-specific HIV incidence rates in the general population using HIV prevalence data from two sequential surveys in the country [6], [7], [8], [9].
Patients could participate in multiple sequential surveys during one intervention period.
An iterative approach was employed where sequential surveys were presented to the panel of experts to gain consensus [ 34].
It is unlikely that the methodological differences between surveys explained changes in compliance as the same survey instrument, methodology and schools were used for all the sequential surveys.
When incidence risk estimates from sequential surveys differ substantially and pooling over time accordingly is questionable, our advice is to first estimate the composite estimates, which describe the effect of E on O for each survey round.
The analysis was limited to 27 countries in Africa, Asia, the Middle East and North Africa, and Latin America and the Caribbean that 1) were among the 68 so-called "Countdown" countries with the highest burden of maternal and child deaths [ 2] and 2) had two sequential surveys with data available and of reasonable quality on a wide range of indicators.
Even though the evidence from these two sequential surveys suggests that the quality of antimalarial medicines has improved over the last decade, the inter-tablet variability found in the samples and the low amounts of API found in some chloroquine vials suggest that substandard medicines may continue to be available in southern Laos.
A link with airborne dust pollution was demonstrated [ 2, 16] and as a consequence further sequential surveys were planned in the same primary schools to assess the health trends in children, and to monitor the effects of proposed environmental interventions through community surveillance.
