Studies on hospital falls that focus on occurrences over time are limited to the frequencies of falls during the hours of the day [ 1, 5- 7, 11, 12], and to specific time spans e.g. number of falls within the first week of hospitalization [ 2, 4, 7, 13].
The majority of skin cancer chemoprevention studies focus on occurrence of new nonmelanoma skin cancers (NMSC) in individuals with a previous NMSC, or on reduction in the number of premalignant skin lesions such as actinic keratoses (AK).
Furthermore, as most content analysis carried out using the internet has no theoretical basis to it, with the focus being on what is measureable rather than on what is theoretically significant (Bryman and Bell 2007), it was important for us to focus on occurrence alongside frequency.
We then focussed on occurrences found exclusively in rainforests, and analysed their distribution as a function of environmental features including (i) the substrate type (UM or non-UM), (ii) elevation and (iii) mean annual rainfall.
The evaluation focuses on occurrence, distribution and geochemistry in 26 water samples collected from borewells spread across the entire study area homogeneously.
Ophthalmic research in the Rotterdam Study focusses on occurrence, causally related determinants, and predictors of common eye diseases.
Participants who do not respond to the long questionnaire receive a short questionnaire, which focuses on occurrence of disease but does not include questions about physical inactivity.
Simple focus on disease occurrences, such as human cases, treats the entire transmission system as a black box and as such gives an overall picture of the ecology of the transmission chain of that disease (12 ).
In order to contextually correlate base pairing geometries with 3D RNA structures, these databases mainly focus on crystal occurrences of different base pair types, their structural annotation and geometric descriptions.
In Hormozdiari et al. (2007) it was observed that sparsification as suggested by Han et al. (2005) has limited effect on the distribution of all subgraph topologies of up to six vertices, provided one focuses on induced occurrences of these subgraphs.
