Displaying custom post type field, but displaying the repeating ones only once.

Hi everyone,

Hope someone can help me here.

I am using WP Types plugin to create custom post types. so the thing is i have a post type with doctors and their city and state as custom fields.

so from another post type page i am trying to populate all the cities within a state.

So far i am able to pull the cities corresponding to that state but since i have several doctors in a city the cities repeat themselves.

How can i prevent this to happen so it only displays the city one time?

this is my code

<?php 

$states_var = $_GET['states'];

$loop = new WP_Query( array( 'post_type' => 'doctors', 'posts_per_page' => 10 ) );

while ( $loop->have_posts() ) { 

		$loop->the_post();

		$cities = get_post_meta($post->ID,'wpcf-city');
		$states = get_post_meta($post->ID,'wpcf-state');

		foreach($states as $state){

				if($state == $states_var){

						foreach ($cities as $city) {

									echo "<a href=\"?cities=main&city=".$city."\">".$city."</a><br />";

						}
				}
		}

}
?>

[No bumping, thank you.]