Table 2. Preliminary dataset, records identified via PubMed and ICL (Index to Chiropractic Literature) keyword searches (includes duplicates).

Keyword	Chiropractic		Spinal manipulation		Total references per batch
	PubMed	ICL	PubMed	ICL
Autoimmune	35	14	26	1	76
Blood Pressure	71	74	78	26	249
Cortisol	7	10	10	4	31
Cytokine	29	5	69	29	110
HRV or Heart Rate Variability	27	53	30	23	133
Immune or Immunity	93	94	84	55	326
Interferon	6	2	8	2	18
Interleukin	18	9	29	10	66
Sleep	87	152	33	27	299
Substance P	5	0	13	0	18
TGF or Transforming Growth Factor	4	1	8	1	15
TNF or Tumor Necrosis Factor	14	16	25	15	70
TOTAL					1410