Given the following text, extract up to 10 medical keywords from the text. Avoid stopwords. Provide keywords in the following comma-separated format: 'KEYWORDS: '\n '
Chronic pain is a large NAME_1 worldwide health problem with
approximately 20% of the population reporting chronic pain of
moderate to severe intensity (Breivik NAME_2 NAME_3., 2006). The orofacial
region is one of the most frequent locations for chronic pains,
with a prevalence of 5–33% worldwide (NAME_4 NAME_2 NAME_3., 2001,
2002, 2004; Isong NAME_2 NAME_3., 2008; Schiﬀman NAME_2 NAME_3., 2014). The
most common diagnosis of the temporomandibular disorders
(TMD) is masticatory muscle pain, i.e., myalgia (LeResche,
1997). Previous studies have shown that pain aﬀects jaw motor
control (Lund NAME_2 NAME_3., 1991; Svensson NAME_1 Graven-NAME_5, 2001;
NAME_6 NAME_1 NAME_7, 2007) hence TMD is often accompanied by
pain upon chewing, restricted mouth opening NAME_1 impaired
maximal (premolar/molar) bite force (Felício NAME_2 NAME_3., 2002; Goiato
NAME_2 NAME_3., 2017; NAME_8 NAME_2 NAME_3., 2017). In the past, diﬀerent theories
have attempted to explain how pain NAME_1 jaw function interrelate There should be exactly 7 paragraphs separated by the markdown divider: ***.
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