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However, systematic sample collection from all the admitted patients was continued throughout the study period CFR, the percentage of deaths out of the total confirmed cases of the disease [25], was determined following the method suggested by Garske et al [12].
‡Tuberculosis developed and patient died before systematic sample collection and storage.
In fact, research in this area is hampered by the lack of systematic sample collection during the 2003 SARS outbreak which lasted for a relatively short period of ∼ 16 weeks.
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From June to October 2010, a subset of women screened with visual inspection methods also underwent a systematic cervical sample collection for HPV genotyping during 1 week per month in each of these two clinics.
However, it may also be due to some unidentified but systematic difference in sample collection between the two sampling rounds, which could also influence results for other chemicals.
Unfortunately, because of logistical difficulties, systematic data and sample collection and analysis could not be conducted for all case-patients in Bac Giang hospital.
However, since we saw decreases for legacy OCs, which should generally have minimal changes between 2006 and 2011, the PBDE reduction may reflect some unidentified but systematic difference in sample collection (see Legacy Chemicals below).
3 Such systematic ascertainment biases in sample collection for large-scale case-control studies suggest that the prevalence of genomic disorders in schizophrenia may be underestimated.
Systematic sampling was used for sample collection.
Cases continued to be detected in 2004, 2005, and 2006, but this was not based on a systematic data collection but a sample collection for parasite identification.
In 1960s to 1970s, a group of Japanese researchers had made systematic oriented-sample collections from baked clay at many pottery kilns excavated in and around Sakai city, Osaka prefecture, Japan.
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