The best replacement for b27 is n2.

The best alternatives to b27 are rated as following:
★★★★★  n2
★  b21

Your alternative for b27 is not listed? Suggest!
Speaking about b27, one probably shouldn't forget about ankylosing spondylitis.

Other search terms related to b27 and their ratings are:
★★★★★ ankylosing spondylitis
You have in mind a companion for b27 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of b27 in all years. Click on graph for more.
b27
n2
b21