Materials and methods
We created a GitHub wiki to describe the databases in order to make the information available to the public. To create the GitHub page and GitHub wiki, we followed the several straightforward steps described in the GitHub documentation [4,5].
Structure of dataset description
To create the OnetoMap Git repository and insert dataset details, we began by selecting datasets of interest based on specific elements, such as the type of data available. We provided an overview of each dataset using information from data documentation, dictionaries, public use files (PUFs), and PubMed entries. We described all datasets following a set of criteria aiming to ensure that researchers have a good overview of the dataset of interest (Figure 1). We defined these criteria based on key elements such as data collection, years available, and variable type. Overall, we used the following fields in the description of the datasets: (1) general description (including data type, source, minimal level of collection of data, and geographic location of the data collection sites), (2) applicable methods, (3) high-impact designs, (4) data dictionary (which we present in details as a separate page), (5) variable categories, and (6) linkage to other datasets. A detailed explanation of each field is available in Table 1.