Table 1 Search strategy for MEDLINE (PubMed)

1

cytokine[mesh] OR cytokine OR cytokines OR interleukin OR interleukins OR chemokines OR chemokine OR interferon OR interferons OR “tumor necrosis factor” OR macrophage OR “growth factor” OR “growth factors” OR lymphokine OR lymphokines OR metallopeptidase OR metallopeptidases OR metalloprotease OR metalloproteases OR metalloproteinase OR metalloproteinases OR “C reactive protein” OR “C-reactive protein” OR Inflammation OR inflammatory OR proinflammatory

2

“Amniocentesis”[Mesh] OR “Amniotic Fluid”[Mesh] OR amniot*[tiab] OR amniocent*[tiab] OR intra-amniot*[tiab] OR intraamniot*[tiab]

3

#1 AND #2

4

(animals[mesh] NOT humans[mesh])

5

#3 NOT #4