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  • Quasi-randomized clinical trial

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    Table 11. Characteristics of studies comparing vas occlusion techniques with and without folding back
    Authors and Year of Publication
    Type of Study
    Subject's Eligibility Criteria
    Sample Size*
    Setting
    Study Period
    Interventions
    Type and Number of Surgeons
    Isolation Method
    Occlusion
    Method
    Gupta et al.
    1977
    Randomized clinical trial
    Men requesting sterilization (35 to 50 years old)
    Exclusion unspecified
    No FB: 50
    FB: 50
    Unspecified,
    India
    Unspecified
    One midline opening
    No FB: Ligation with 2 tantalum Hemoclips at 5 mm distance, (originally 1 later 2 per end) + Vas uncut
    FB: Ligation with silk + Folding back (distal end) + Excision (10 mm)
    Unspecified
    Simcock
    1978
    Case series with historical controls
    Unspecified
    No FB: 72
    FB: 718
    Family planning clinic,
    Australia
    Unspecified but after 1972
    One midline opening
    No FB: Ligation with Dexon (two ends) + Vas cut (excision )
    FB: Ligation with silk, + FB (testicular end) +(excision )
    One surgeon (type unspecified)
    Clausen et al.
    1983

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