1	TITLE-ABS-KEY(clinic OR clinical OR “electronic health record” OR “electronic health records”)
2	TITLE-ABS-KEY(“coreference resolution” OR “co-reference resolution” OR “information extraction” OR “named entity extraction” OR “named entity recognition” OR “natural language processing” OR “relation extraction” OR “text mining”)
3	TITLE-ABS-KEY(“information retrieval”)
4	PUBYEAR AFT 2008 AND LANGUAGE(english)
5	(1 and 2 and 4) and not 3
6	DOCTYPE(le) OR DOCTYPE(ed) OR DOCTYPE(bk) OR DOCTYPE(er) OR DOCTYPE(no) OR DOCTYPE(sh)
7	5 and not 6
8	PMID(0*) OR PMID(1*) OR PMID(2*) OR PMID(3*) OR PMID(4*) OR PMID(5*) OR PMID(6*) OR PMID(7*) OR PMID(8*) OR PMID(9*)
9	7 and not 8