Table 1. Included studies and methodological quality assessment score.
| First author | Study design | Year | Country | Score |
|---|---|---|---|---|
| AYATOLLAHI J (Ayatollahi, Ayatollahi & Ardekani, 2012) | Narrative review | 2012 | Iran | 3 |
| ABICHANDANI S (Abichandani, Shaikh & Nadiger, 2013) | Narrative review | 2013 | India | 6 |
| ANGHEL M (Anghel et al., 2007) | Cross sectional | 2007 | Romania | 6 |
| CUSTODIO R (Custodio, Silva & Brandão, 2012) | Case study | 2012 | Brazil | n. a. |
| DABLE R (Dable et al., 2014) | Clinical trial | 2014 | India | 4 |
| DESAI V (Desai, Pratik & Rajeev, 2012) | Cross sectional | 2012 | India | 8 |
| FINKBEINER B (Finkbeiner & Muscari, 2011) | Narrative review | 2011 | USA | 3 |
| GOPINADH A (Gopinadh et al., 2013) | Cross sectional | 2013 | India | 5 |
| GOSAVI S (Gosavi, Gosavi & Jawade, 2012) | Narrative review | 2012 | India | 3 |
| GUPTA A (Gupta, Ankola & Hebbal, 2013) | Narrative review | 2013 | India | 6 |
| GUPTA A (Gupta et al., 2014) | Narrative review | 2014 | India | 4 |
| GUPTA SHIPRA (Gupta, 2011) | Narrative review | 2011 | India | 3 |
| HADDAD O (Haddad et al., 2012) | Clinical trial | 2012 | Iran | −1 |
| HARUTUNIAN K (Harutunian et al., 2011) | Cross sectional | 2011 | Spain | 2 |
| HOKWERDA O (Hokwerda, 2008) | Narrative review | 2008 | Holland | 5 |
| JODALLI P (Jodalli et al., 2015) | Narrative review | 2015 | India | 3 |
| KHALEKAR Y (Khalekar et al., 2016) | Narrative review | 2016 | India | 6 |
| KUMAR D (Kumar et al., 2014) | Narrative review | 2014 | India | 5 |
| LEGGAT P (Leggat, Kedjarune & Smith, 2007) | Narrative review | 2007 | Australia | 6 |
| MEHTA A (Mehta, Gupta & Upadhyaya, 2013) | Cross sectional | 2013 | India | 2 |
| MORSE T (Morse, Bruneau & Dussetschleger, 2010) | Cross sectional | 2010 | USA | 7 |
| PEROS K (Peros et al., 2011) | Cross sectional | 2011 | Croatia | 8 |
| PETROMILLI GARCIA P (Garcia, Presoto & Campos, 2013) | Cross sectional | 2013 | Brazil | 3 |
| PIRVU C (Pirvu et al., 2014) | Narrative review | 2014 | Romania | 4 |
| RYTKONEN E (Rytkönen et al., 2006) | Cross sectional | 2006 | Finland | 5 |
| SAKZEWSKI L (Sakzewski & Naser-ud-Din, 2014) | Narrative review | 2014 | Australia | 3 |
| THAKAR S (Thakar et al., 2015) | Cross sectional | 2015 | India | 6 |
| WILLIAMSON R (Williamson, 2015) | Narrative review | 2015 | USA | 1 |
| YAMALIK N (Yamalik, 2007) | Narrative review | 2007 | Turkey | 6 |
Notes.
- n.a.
- not applicable