As a large proportion of the database records contained information on sampling date or year, we used the year of first collection for each species within a sub-region to construct an accumulation curve of species discovery (across all taxonomic groups) over time.
Thus, we subtracted year of first collection from 1999, the latest date in the checklist, to derive a value for minimum years since introduction (∼10 ∼150 years) to Hawaii.
Eruptions are labelled by date of first sample collection in each case.
I don't know if Christopher Hitchens left written instruction, but the publication date of this sixth collection of his essays seems pointedly to have been designed to miss Christmas lists.
$$\end{document} Percent compliance = 100 × number of instillations received / date of diary collection - date of first dose + 1.
Inclusion criteria at the time of data collection were a date of first employment between 1946 and 1989 with a minimum duration of employment of 180 days.
Other information collected were date of onset of pulmonary symptoms, date of first visit to a health facility, dates of collection of all three sputum samples, and date of starting treatment.
We estimated the between-patient mutation rate using linear regression of the number of SNPs by time between disease onset dates (taken as the date of first evidence of tuberculosis the earliest of date of collection of the first positive sample, or registration or treatment) in the patients connected in the network.
A standardized questionnaire was used to collect information about demographic features, exposure history, clinical signs and symptoms, date of onset, date of first medical visit, number of medical visits after onset, date of hospitalization, date of specimen collection, date of viral infection confirmation and information on close contacts.
