Table 1. Search Strategy.

1	(type 2 or type2 or type II or non-insulin dependent or adult onset).tw. (400869)
2	(diabet or antidiabet).tw. (817946)
3	1 and 2 (199667)
4	Diabetes Mellitus, Type 2/(204183)
5	3 or 4 (262903)
6	(dpp-4 or dpp 4 or dpp4 or dpp-IV or dpp IV or dppIV or dipeptidyl-peptidase 4 or dipeptidyl peptidase 4).tw. (7463)
7	(incretin or glucose-dependent insulinotropic peptide or gastric inhibitory peptide or GIP or glucagon-like peptide-1 or GLP-1).tw. (20226)
8	(sitagliptin or vildagliptin or gliptin or alogliptin or gemigliptin or linagliptin or saxagliptin).tw. (4061)
9	6 or 7 or 8 (25825)
10	5 and 9 (11338)
11	(asia or pacific or American Samoa or Australia or Brunei or Cambodia or Chin or Hong Kong or Indonesia or Japan or Laos or Macau or Malaysia or Mongolia or Myanmar or New Zealand or North Korea or Papua New Guinea or Philippine or Singapore or South Korea or Taiwan or Thailand or Timor-Leste or Vietnam).tw. (1238790)
12	10 and 11 (522)