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    "country_code": "EG",
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    "country_name": "France",
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    "measurement_method": "Bone-pressed, stretched three times",
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    "measurement_method": "Measured by one examiner",
    "source": "Spyropoulos et al., Urology, 2002",
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    "country_name": "India",
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    "measurement_method": "Measured by three examiners",
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    "measurement_method": "Measured by clinician",
    "source": "Baghdad reference-range study, Arab J Urol, 2017",
    "source_year": 2017,
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    "measurement_method": "Measured by one examiner (median)",
    "source": "Ponchietti et al., Eur Urol, 2001",
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    "measurement_method": "Measured by clinician",
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    "country_name": "Nigeria",
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    "measurement_method": "Measured twice by one investigator",
    "source": "Orakwe et al., 2006",
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  {
    "country_code": "PT",
    "country_name": "Portugal",
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    "sample_size": 498,
    "measurement_method": "Bone-pressed, measured",
    "source": "Pereira, 2004",
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    "country_code": "RO",
    "country_name": "Romania",
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    "sample_size": 0,
    "measurement_method": "Widely-cited aggregate — no primary study traced",
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    "source_year": 2026,
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    "country_code": "KR",
    "country_name": "South Korea",
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    "measurement_method": "Measured by clinician",
    "source": "Hwang et al., 2005",
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    "country_code": "ES",
    "country_name": "Spain",
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    "measurement_method": "Measured by clinician",
    "source": "Gómez de Vicente et al., 2001",
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    "country_code": "TZ",
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    "sample_size": 93,
    "measurement_method": "Measured by clinician",
    "source": "Chrouser et al., 2013",
    "source_year": 2013,
    "source_url": "https://www.auajournals.org/doi/abs/10.1016/j.juro.2013.02.3200",
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    "measurement_method": "Measured by clinician",
    "source": "Söylemez et al., Int J Impot Res, 2011",
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    "country_name": "United Kingdom",
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    "measurement_method": "Measured by clinician",
    "source": "Khan et al., BJU Int, 2011",
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    "source_url": "https://pubmed.ncbi.nlm.nih.gov/21711435/",
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    "measurement_method": "Measured by one examiner",
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    "measurement_method": "Measured by clinician (median)",
    "source": "Nguyen Hoai et al., Andrology, 2021",
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