Table 5.

Keywords cluster.

ID Ranking (#)	Size	Silhouette	Top-term (LLR)
0	17	0.924	Episodic and chronic tension-type headache (62.98, 1.0E-4); definition (62.98, 1.0E-4); pathophysiology (59.55, 1.0E-4); acute treatment (51.01, 1.0E-4); prophylaxis (44.5, 1.0E-4);
1	17	0.882	COVID-19 (12.26, 0.001); low back pain (9.24, 0.005); neck pain (9.21, 0.005); best evidence synthesis (8.17, 0.005); systematic review (8.06, 0.005);
2	15	0.898	Primary care (13.73, 0.001); acupuncture therapy/adverse effects (9.59, 0.005); acupuncture/history/standards (9.59, 0.005) back pain (9.24, 0.005); complementary and alternative therapy (cam) (9.24, 0.005)
3	14	0.872	Population (8.11, 0.005); serum (8.11, 0.005); ionized magnesium level (8.11, 0.005); gold meridian (8.11, 0.005); controlled trial (8.11, 0.005)
4	14	0.945	Trigger points (11.68, 0.001); clinical efficacy (10.68, 0.005); migraine prophylaxis (10.68, 0.005); zhengtian pill (10.68, 0.005); myofascial pain syndrome (10.68, 0.005)
5	13	0.931	Vertigo (15.91, 1.0E-4); hemiplegia (15.91, 1.0E-4); 4-gate points (9.53, 0.005); yuan point (9.53, 0.005); stroke (9.53, 0.005)
6	12	0.835	Cervicogenic headache (19.45, 1.0E-4); neck (13.83, 0.001); tenderness (13.83, 0.001); dysfunction (13.83, 0.001); chiropractic (12.13, 0.001)
7	11	0.899	Placebo needle (17.67, 1.0E-4); tension headache (11.76, 0.001); acupuncture research (11.76, 0.001); osteoarthriti (9.68, 0.005); deqi (8.05, 0.005)