Any county, city, or town is hereby authorized to issue bonds for constructing and equipping a hospital, community mental health facility, public health center, or related health facility, to be owned and operated by such county, city, or town in accordance with standards approved by the State Commissioner of Health; provided, that such bonds may be issued to construct a jointly owned and operated hospital, community mental health facility, public health center, or related health facility, by two or more counties, or by one or more counties and a city or cities, or by two or more cities. Such bonds shall be issued upon the assent thereto of three-fifths ( 3/5 ) of the voters of the subdivision issuing the bonds, voting at an election held for that purpose.