Table 5. Number of different guidelines occurrence in the study.

No.	FHR guidelines Types	Reference
1	FIGO (International Federation of Obstetrics and Gynecology)	Nagendra et al. (2017), Das, Roy & Saha (2015b), Cömert & Kocamaz (2017b), Gavrilis, Nikolakopoulos & Georgoulas (2015), Fergus, Selvaraj & Chalmers (2018), Czabański et al. (2013), Czabanski et al. (2015) Chudáček et al. (2014), Das, Roy & Saha (2015a), Kim, Yang & Lee (2017), Spilka et al. (2017), Romano et al. (2016), Wróbel et al. (2013), Bhatia et al. (2017), Rei et al. (2015), Garabedian et al. (2017), Nunes & Ayres-de Campos (2016)
2	NICHD (the National Institute of Child Health Development)	Das, Roy & Saha (2015b), Das, Roy & Saha (2015a), Romano et al. (2016), Rei et al. (2015), Di Tommaso et al. (2013), Gamboa et al. (2017), Garabedian et al. (2017)
3	NICE (National Institute of Health and Care Excellence)	Pinas & Chandraharan (2016), Das, Roy & Saha (2015a), Bhatia et al. (2017)
4	ACOG (the American College of Obstetricians and Gynecologists)	Das, Roy & Saha (2015b), Das, Roy & Saha (2015a)
5	RCOG (the Royal College of Obstetricians and Gynecologists)	Das, Roy & Saha (2015a), Ghi et al. (2016)
6	CNGOF (the French College of Gynecology and Obstetrics)	Garabedian et al. (2017)
7	NICHHD (the National Institute of Child Health and Human Development)	Nunes & Ayres-de Campos (2016)