In almost all cases, the measures of aggregate stability given in the analysed paper based on the quantity of water stable soil microaggregates of size >0.25 mm (see Additional file 4).
Point b) The heterogeneity of publications could be a risk bias; we considered only original reports that were the large majority of the analysed paper (71.4%), and reviews as other papers were considered only to confirm the results from those original reports.
The flexural vibration of a homogeneous isotropic linearly elastic cylinder of any aspect ratio is analysed in this paper.
CM contributed to the conception of the paper, analysed and interpreted the data and drafted the manuscript.
Oxidase activity was analysed using filter-paper disks (Sartorius grade 388) impregnated with 1% solution of N,N,N′,N′-tetramethyl p-phenylenediamine (Sigma-Aldrich); a positive test was defined by the development of a blue-purple colour after applying biomass to the filter paper.
MR performed science, analysed data and wrote paper; SA performed science and analysed data; AT planned science; MIB planned science, collected patient material, analysed data, and wrote paper; MB planned science, performed science, analysed data, and wrote paper.
The univariate case, in which only one proportion or s share per establishment is analysed and for which papers by Papke and Wooldridge ([1996], for cross-sectional and [2008] for panel data) represent crucial contributions to the literature, will not be discussed in detail.
