multisymbol_to_entrez_ids: multisymbol_to_entrez_ids
In russHyde/miiq: Microarrays Are Awesome: Get Them Analysed HERE!

A function to map a vector of gene symbols to Entrez gene ids. The input may contain "multiple|joined|symbols", and if it does, the output for that entry will contain a "joined|string|of|ids" containing all of the unique values that any of the input symbols mapped to See symbol_to_entrez_id for further details

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multisymbol_to_entrez_ids(gene_symbols = character(0),
  symbol_type = "SYMBOL", entrezgene_db = NULL,
  split_character = "\\|", collapse_character = "|", quiet = TRUE)

`gene_symbols`	vector of gene_symbols of a single type.
`symbol_type`	type of the gene_symbols (eg, Refseq).
`entrezgene_db`	database for mapping gene_symbols to entrez.ids.
`split_character`	character string for splitting up the symbols if any of the input entries contains more than one symbol.
`collapse_character`	character for collapsing entrez ids.
`quiet`	BOOLEAN should dplyr progress bar be suppressed (sideeffect).