“…All papers are present in googlescholar.com and in one or some among the following 132 sources which can be classified into three groups. The first group includes 3–50 papers, including: researchgate.net (Murphy, 2020), search.proquest.com (Doberstein et al , 2019), ebscohost.com (Deshmukh and Hastak, 2012), europepmc.org (da Silva et al , 2015), pubmed.ncbi.nlm.nih.gov and safetylit.org (Cui et al , 2018), academia.edu (Comes et al , 2019), econpapers.repec.org (Chandra et al , 2013), semanticscholar.org (Cha et al , 2016), core.ac.uk and Elsevier (Carlile and Christensen, 2004), Taylor & Francis (Canyon et al , 2015), mdpi.com, ncbi.nlm.nih.gov and Springer (Berke et al , 2011), cabdirect.org (Barameda and Barameda, 2011), ingentaconnect.com (Bacud, 2018), cambridge.org (Alshehri et al , 2013) and Wiley Online Library (Alaedini et al , 2011). The second one comprises 21 sources, namely: search.informit.org, knowledge.aidr.org.au, Citeseer, American Public Health Association, ascelibrary.org, cphd.ph.ucla.edu, cyberleninka.org, Eric, espace.library.uq.edu.au, etc.…”