Question: What do Regina Pizzeria and Donatos Pizza have in common?

Context paragraphs:
Pizza Time of St. Augustine: Pizza Time is a pizzeria located in St. Augustine, Florida considered the second-highest rated pizzeria in the United States as of 2015 after Juliana's Pizza.  The pizzeria opened in 2005 by Domenico Conslignarnio.

Pizza delivery: Pizza delivery is a service in which a pizzeria or pizza chain delivers a pizza to a customer.  An order is typically made either by telephone or over the internet to the pizza chain, in which the customer can request pizza type, size and other products alongside the pizza, commonly including soft drinks.  Pizzas may be delivered in pizza boxes or delivery bags, and deliveries are made with either an automobile, motorized scooter, or bicycle.  Customers can, depending on the pizza chain, choose to pay online, or in person, with cash, credit or a debit card.  A delivery fee is often charged with what the customer has bought.

Rabbe Grönblom: Rabbe Anders Grönblom (May 3, 1950 Helsinki, Finland – June 29, 2015) was a Finland-Swedish businessman who started a successful pizza business in Vaasa, Finland.  His first company—a pizzeria—was called "O sole mio" and it was founded in 1976 in the center of Vaasa.  From there he expanded to a pizza franchise chain first called "Pizzeria N:o 1".  He was known as the "Pizza-emperor" (Pizzakeisari in Finnish), because he was the founder of a well known pizza franchise chain called Kotipizza which was the new name of "Pizzeria N:o 1" which expanded fast outside of Vaasa.  The chain is said to be the biggest one in the Nordic countries.  He was also the founder of a shipping company called RG Line, a hotel chain called Omenahotelli and another pizza chain called Golden Rax Pizzabuffet.  Most of his companies are subsidiaries of Grönblom International LTD, where Rabbe Grönblom acted as director.  Golden Rax Pizzabuffet however is nowadays a part of Finland's largest hotel & restaurant company Restel Oy Ltd, where Rabbe Grönblom sat on the board.  He was also on the board of the Finnish tyre company Nokian Renkaat (since 2003).

Donatos Pizza: Donatos Pizza is a pizza delivery restaurant chain headquartered in Columbus, Ohio.  It has nearly 200 locations in eight states, with the majority of locations in Ohio.  Donatos is also served at several venue outlets including Ohio Stadium and the Smithsonian National Air and Space Museum.

New Haven-style pizza: New Haven-style pizza, locally known as apizza ( , from Neapolitan "’a pizza" (] ) "the pizza"), is a style of Neapolitan pizza common in and around New Haven, Connecticut.  It originated at the Frank Pepe Pizzeria Napoletana and is now served in many other pizza restaurants in the area, most notably Sally's Apizza and Modern Apizza.  This geographically limited pizza style has been favorably referenced by national critics.

Kesté: Kesté Pizza & Vino, also known as Kesté Pizzeria or simply Keste's, is a pizzeria, located in Manhattan, that serves Neapolitan-style wood-fired brick oven pizza.  As of 2015, it is the fourth-highest rated pizzeria in the United States on TripAdvisor.

Uno Pizzeria &amp; Grill: Uno Pizzeria & Grill (formerly Pizzeria Uno and Uno Chicago Grill), or more informally as Unos, is a franchised pizzeria restaurant chain under the parent company Uno Restaurant Holdings Corporation.  Uno Pizzeria and Grill is best known for its Chicago-style deep dish pizza.  Ike Sewell opened the first Pizzeria Uno in 1943.

Pizza Land: Pizza Land is an independently owned pizzeria located at 260 Belleville Turnpike in North Arlington, New Jersey, which featured in the opening credits of "The Sopranos".  Additionally, in "Law & Order" episode 10.6, "Marathon" (1999), a pizza box from the restaurant was used by a suspect to transport and conceal firearms.  The pizzeria was opened in 1965 by Italian immigrant Frank Di Piazza, who died in 1991.  The pizzeria was built by Pietro Di Piazza.  It was owned by Frank's son Tony Di Piazza .  Tony and Debra Hunkele always had the pizzeria packed but later on sold to pizza maker Al Pawlowicz until his death in 2010, who purchased the restaurant from DiPiazza's son.  The store is now owned by Eddie Twdroos.

Regina Pizzeria: Regina Pizzeria, also known as Pizzeria Regina, and originally called Regina Pizza, is a regional pizza chain in New England.  The company was founded in 1926 by Luigi D'Auria in Boston's North End neighborhood.  It has been run by the Polcari family since 1956.  The chain is a part of Boston Restaurant Associates and is headquartered in Lynnfield, Massachusetts.

California-style pizza: California-style pizza (also known as California pizza or Gourmet pizza) is a style of single-serving pizza that combines New York and Italian thin crust with toppings from the California cuisine cooking style.  Its invention is generally attributed to chef Ed LaDou, and Chez Panisse, in Berkeley, California.  Wolfgang Puck, after meeting LaDou, popularized the style of pizza in the rest of the country.  It is served in a number of California Cuisine restaurants.  Such restaurant chains as California Pizza Kitchen, Extreme Pizza, and Sammy's Woodfired Pizza are three major pizza franchises associated with California-style pizza.  Nancy Silverton's Pizzeria Mozza is also a popular California-style pizza restaurant in Los Angeles.

Supporting paragraphs: Regina Pizzeria Donatos Pizza
Answer: pizza chain