On Doctoring MEDLINE searches, with reference librarian comments

The question was

"Explore new treatment of hypertension. JNC guidelines"

1 :  *Hypertension/ or exp antihypertensive agents/ or exp         {91952}
clinical trials/ or "hypertension treatment".mp.
2 :  limit 1 to (human and english language and yr=1998-1999)         {5057}
3 :  *Antihypertensive agents/ or *Hypertension/ or "jnc         {28346}
guidelines".mp.
4 :  limit 3 to yr=1998-1999         {2023}
5 :  *Hypertension/ and exp antihypertensive agents/ and exp         {14}
clinical trials/ and "hypertension treatment".mp.
6 :  limit 5 to (human and english language and yr=1998-1999)         {2}
7 :  *Hypertension/ or "jnc guidelines".mp.         {25699}
8 :  limit 7 to (english language and yr=1998-1999)         {1496}
9 :  *Hypertension/ and "jnc guidelines".mp.         {2}
10 :  limit 9 to (english language and yr=1998-1999)          { 0}

Reference Librarian comments

Good job. A good idea is to put only one MeSH (Medical Subject
Heading) idea into a set, so that you can get to the subheadings.
But you Focused, and Exploded, and Limited, and so -- your MEDLINE
skills are coming along. Congrats.