Syntax Issues with API Call

Can anyone identify what is wrong with this function?

I know a "Token Comma Expected" however, I cannot figure out to fix this problem. The bolded/underlined phrases below are whats giving me this problem:

Source = Csv.Document(Web.Contents("https://ClinicalTrials.gov/api/query/study_fields?&fields=NCTId,LeadSponsorName,Phase,BriefTitle,Org...max_rnk=" & Number.ToText( limit )"&fmt=csv&min_rnk=" & Number.ToText( offset )),[Delimiter=",", Columns=7, Encoding=65001, QuoteStyle=QuoteStyle.None]),