01	“mouth breathing”[MeSH Terms] OR mouth breathing[Text Word]
02	oral breathing
03	oral respiration
04	breathing mouth
05	1 or 2 or 3 or 4
06	postural disorders
07	posture
08	postural
09	postural abnormalities
10	kinesis
11	positioning
12	orthostatic
13	6 or 7 or 8 or 9 or 10 or11
14	05 and 13
15	“child”[MeSH Terms] OR children[Text Word]
16	preschool children
17	adolescent
18	15 or 16 or 17
19	14 and 18
20	research design
21	comparative study
22	20 or 21
23	19 and 22