ccb-hms/nhanes-database

Replace manual rvest manifest with nhanesA manifest

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In the download.R file, we use rvest to loop over the manifest to create the tables to download. We now want to get the manifest using nhanesA instead.

nhanesManifest("public") : public tables
nhanesManifest("limited") : limited access tables
nhanesManifest("var") : all variables in all tables

nhanesFromURL() downloads an NHANES table from a URL and returns it as a data frame