Unless commenced within thirty days after the date of the filing of the certificate of the canvass of an election on the proposition of creating a new public hospital capital facility area pursuant to this chapter, no lawsuit whatever may be maintained challenging in any way the legal existence of the public hospital capital facility area or the validity of the proceedings had for the organization and creation thereof. If the creation of a public hospital capital facility area is not challenged within the period specified in this section, the public hospital capital facility area conclusively must be deemed duly and regularly organized under the laws of this state.