“syphilis”,
“incidence”,
“recent infection”,
“acute infection”,
“seroconversion”,
“MSM”,
“gay”,
“sex between men”,
“China”.
Combination of the options of search terms 1 and 9 and 2 or 3 or 4 or 5 and 6 or 7 or 8 above
Combination of the options of search terms 1, 8 and 9 above
Limit 11 to "review articles"
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