We developed LC-MS/MS methods that utilized standard addition without internal standard (IS).
The statistical analysis utilized standard methods using SAS software (version 8.2; SAS Institute, Cary, NC, USA).
We found no previous studies on work and life stress for this population that utilized standard methods of measurement.
Statistical analysis of data utilized standard methods using SAS software (version 11; SAS Institute, Cary, NC, USA), including Fisher's exact test, analysis of variance (ANOVA) and Tukey's test where appropriate, correlation analyses and t tests.
Other ecological studies of cholera that have utilized standard statistical methods include Ackers et al.[ 5], Mugoya et al.[ 6] and Sasaki et al.[ 7].
As illustrated in Fig. 1, this method is based on a widely utilized standard ChIP protocol [ 5], where the main modification is the introduction of a chemically modified recombinant histone H3 as the carrier.
Subsequent experiments utilized standard banked material that was frozen via a liquid nitrogen vapor sandwich method [ 3, 4].
This is the standard method utilized by Santos and others for assessing occupational exposures to inorganic mercury and generally reflects relatively recent exposures [ 1, 35].
BactoScan (Foss Analytical, Hillerød, Denmark), an automated standard flow cytometric method utilized for routine testing of milk quality, and TEMPO (bioMérieux, Marcy l'Etoile, France), an automated most-probable-number method, were used to assess the total viable bacterial count in farm and commercial milk samples.
