On Doctoring MEDLINE searches, with reference librarian comments

The question was

"Actinic Keratosis"

1 :  "ACTINIC KERATOSIS".mp.         {128}
2 :  *Keratosis/         {536}
3 :  Skin neoplasms/         {16308}
4 :  2 and 3         {118}
5 :  limit 4 to (local holdings and human and english language)         {78}
6 :  1 or 5         {187}
7 :  limit 6 to (local holdings and human and english language)         {122}
8 :  limit 7 to ((middle age < 45 to 64 years > or "aged < 65         {59}
and over >" or "aged, 80 and over") and (classical article
or clinical trial or historical article or journal article
or meta analysis or practice guideline or review))
9 :  from 8 keep 11,17,22-23,26,45,58         {7}
10 :  from 9 keep 1-7          { 7}

Reference Librarian comments

I can't quite figure out why you abandoned the "actinic" angle you
had going in set #1. I played a little with this search and tried
the following.

1 :  exp *keratosis/
2 :  1 and actinic.mp.
3 :  limit 2 to (human and english language)
4 :  limit 3 to ==== those age groups you used -----

... and doing this I got 69 references. Just a slightly different
approach, not necessarily "better."