Yes, I did uncomment the if statement and comment the other print. But, I didn't get any output. $foo-> identifiers() prints the following output.

PMID: PMID: 4012367

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it prints this if its only PMID else, if there are two identifiers it prints both the doi and the PMID as follows

PMID: doi:10.1093/fampra/cmq003PMID: 20215333

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In reply to Re^4: Extracting web data by Anonymous Monk
in thread Extracting web data by smandape1

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