Provides functions for querying, retrieving and analyzing
protocol- and results-related information on clinical trials from
two public registers, the 'European Union Clinical Trials Register'
('EUCTR', <https://www.clinicaltrialsregister.eu/>) and
'ClinicalTrials.gov' ('CTGOV', <https://clinicaltrials.gov/>). The
trial information is transformed and stored in a database ('SQLite'
or 'MongoDB', via 'nodbi'). Functions are provided to identify de-
duplicated records, to easily find and extract variables (fields)
of interest even from complex nesting as used by the registers,
and to update previous queries that users retrieved in a database.
The package can be used for meta analysis and trend-analysis of
the design and conduct as well as results of clinical trials.

jsonlite, httr, curl, clipr, xml2, rvest, nodbi (>= 0.4), DBI

jsonlite, httr, curl, clipr, xml2, rvest, nodbi (>= 0.4), DBI,
stringi

Provides functions for querying, retrieving and analyzing
protocol- and results-related information on clinical trials from
two public registers, the 'European Union Clinical Trials Register'
('EUCTR', <https://www.clinicaltrialsregister.eu/>),
'ClinicalTrials.gov' ('CTGOV', <https://clinicaltrials.gov/>) and
the 'ISRCTN' (<http://www.isrctn.com/>).
Trial information is downloaded, converted and stored in a database
('SQLite' or 'MongoDB', via 'nodbi').
Functions are provided to identify de-duplicated records,
to easily find and extract variables (fields) of interest even
from complex nesting as used by the registers, and
to update previous queries that users retrieved in a database.
The package can be used for meta analysis and trend-analysis of
the design and conduct as well as results of clinical trials.

jsonlite, httr, curl, clipr, xml2, rvest, nodbi (>= 0.4.3),
DBI, stringi

jsonlite, httr, curl, clipr, xml2, rvest, nodbi (>= 0.4.3),
stringi

jsonlite, httr, curl, clipr, xml2, rvest, nodbi (>= 0.5.0),
stringi

Query Data from U.S. National Library of Medicine's Clinical
Trials Database
c(
person(given = "Taylor",
family = "Arnold",
email = "tarnold2@richmond.edu",
role = c("aut", "cre"),
comment = c(ORCID = "http://orcid.org/0000-0003-0576-0669")),
person(given = "Auston",
family = "Wei",
email = "awei@telperian.com",
role = c("aut")),
person(given = "Michael J.",
family = "Kane",
email = "michael.kane@yale.edu",
role = c("aut"),
comment = c(ORCID = "http://orcid.org/0000-0003-1899-6662")))
Tools to create and query database from the U.S. National Library
of Medicine's Clinical Trials database <https://clinicaltrials.gov/>. Functions
provide access a variety of techniques for searching the data using range
queries, categorical filtering, and by searching for full-text keywords.
Minimal graphical tools are also provided for interactively exploring the
constructed data.
dplyr, utils, ggplot2, lubridate, plotly, purrr, rlang,
stringi, tibble, DBI, methods, Matrix, htmlwidgets
covr, knitr, rmarkdown, testthat (>= 3.0.0), usethis
Taylor Arnold [aut, cre] (<https://orcid.org/0000-0003-0576-0669>),
Auston Wei [aut],
Michael J. Kane [aut] (<https://orcid.org/0000-0003-1899-6662>)