ClinicalTrials.gov 提供临床试验的研究记录、注册信息和结果信息，并支持搜索功能。
此服务商级交接只保留公开 ID，不会猜测工具或业务任务；请在重新发现时选择当前工具，之后才能把配置视为完整。
Retrieves statistical information about the values of a specified field in the ClinicalTrials.gov database, including missing study counts, unique value counts, and sample values.
Retrieves statistical information about the values of a specified field in the ClinicalTrials.gov database, including min/max values, formats, and missing study counts.
Returns sizes or statistics for fields in study records.
Sizes of list/array fields. To search studies by a list field size, use `AREA[FieldName: size]` search operator. For example, [AREA\[Phase: size\] 2](https://clinicaltrials.gov/search?term=AREA%5BPhase:size%5D%202) query finds studies with 2 phases.
Returns all values found in a single API field for all study records, limited to 250 values.
Retrieves statistical information about the values for a specified field in clinical trials data.
Retrieves statistics for field values in clinical trials data, such as missing counts, longest values, and unique value counts for specified fields like InterventionDescription.
Value statistics of the study leaf fields.
Retrieves statistics for values of a specified field in clinical trials, including type, missing count, longest value, unique count, and top values.
Get statistics about unique values, missing counts, and top values for a specified field in the clinical trials dataset.; Retrieves statistical information about field values in the ClinicalTrials.gov database, including unique value counts, missing study counts, and top occurring values.
Retrieves statistical values for a specified field from the ClinicalTrials.gov database, including unique value counts, top values, and study counts.
Retrieves statistics on unique values for a specified field in clinical trials data, including counts and top values.
Fetches statistical information about field values in the ClinicalTrials.gov database, including missing study counts, unique value counts, and sample content such as the longest BriefSummary.
Retrieves statistics on field values for studies.
Retrieves statistics for the values of specified fields in clinical trial studies, including type, missing count, unique values count, longest value, and top values.
Retrieves statistics for the values of a specified field in clinical trial studies, including unique values count, top values with study counts, and other metadata.
Retrieves statistics on values for specified fields in clinical trials protocols.
Statistics of study JSON sizes.
Returns enumeration types and their values. Every item of the returning array represents enum type and contains the following properties: * `type` - enum type name * `pieces` - array of names of all data pieces having the enum type * `values` - all available values of the enum; every item contains the following properties: * `value` - data value * `legacyValue` - data value in legacy API * `exceptions` - map from data piece name to legacy value when different from `legacyValue` (some data pieces had special enum values in legacy API)
Performs a search and returns full studies or selected fields for a set of study records in JSON or CSV, paginated.
