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. 2019 Apr 11;14(4):e0214199. doi: 10.1371/journal.pone.0214199

Table 1. Geographical distribution, years of publication, income classification of countries (*total adds up to more than 71 as one article covered countries classified in two income groups).

  Papers Countries represented Total
N = 71
Region  
Sub-Saharan Africa
West & Central (Ahorlu et al., 2007)(Alio et al., 2011)(Bass et al., 2008)(Dako-Gyeke et al., 2013)(De Allegri et al., 2007)(Desalliers et al., 2017)(Mensah et al., 2017)(Mwini-Nyaledzigbor et al., 2013)
(Murray et al., 2012)(Soderback et al., 2012)
(Storeng et al., 2010)(Sullivan et al., 2016)
(van der Sijpt, 2010)(van der Sijpt, 2014)
(van der Sijpt & Notermans, 2010)
Ghana, Niger, Burkina Faso, Liberia, DRC, Cameroon 15
East & Southern (Ashaba et al., 2017a)(Ashaba et al., 2017b)(Changole et al., 2017)(Chapman, 2006)(Dennis et al., 2016)(Donnelly et al., 2015)(Drew et al., 2016)(El Ayadi et al., 2017)(Hanlon et al., 2009)(Hannig, 2015)(Kaaya et al., 2010)(Kabakyenga et al., 2011)(Kay et al., 2015)(Kaye et al., 2014b)(Kaye et al., 2014a)(Khisa & Nyamongo, 2012)(Khisa et al., 2017a)(Khisa et al., 2017b)(Mbonye et al., 2006)(Mselle et al., 2011)(Mselle & Kohi, 2015)(Mukwenda et al., 2017)(Muleta et al., 2008)(Mwanri & Gatwiri, 2017)(Rosario et al., 2017)(Stewart et al., 2015)(Turan et al., 2007)(Yeakey et al., 2009)(Yeakey et al., 2011) Eritrea, Ethiopia, Tanzania, Uganda, Kenya, Malawi, Mozambique, Rwanda 29
Middle East &
North Africa
(Assarag et al., 2015) Morocco 1
Latin America &
the Caribbean
(Berry, 2006) Guatemala 1
South Asia (Akhter et al., 2017)(Chatterjee & Fernandes, 2014)(Clarke et al., 2014)(Edhborg et al., 2015)(Head et al., 2011) (Iyengar et al., 2016)(Kalim et al., 2009)
(Matsuyama & Moji, 2008)
(Naved et al., 2012)(Rodrigues et al., 2003)
(Sibley et al., 2007)(Sibley et al., 2009)
(Ravindran et al., 2000)
(Thippeswamy et al., 2015)
(Uzma et al, 1999)
India, Nepal, Bangladesh 15
East Asia & Pacific (Andajani-Sutjahjo et al., 2007)(MacLellan, 2010)(Montesanti, 2011)
(Niemi et al., 2010)(White, 2002)
Cambodia, Vietnam, Indonesia 5
Multiple low &
lower-middle
(Heller & Hannig, 2017)(Maulet et al., 2015)(Menaca et al., 2013) Mali, Niger, Ghana, Ethiopia, Kenya, Malawi 3
Multiple low,
lower-middle & middle/upper
(Horowitz et al., 2001)(Oates et al., 2004) India, Uganda 2
Income classification
Low 42*
Lower-middle 30*