Hide register_post_type in dashboard menu

Hi,

I’m creating a bunch of register_post_type’s but only want 1 to show for the author role. All will still show for the admin role. Any help would be great.

register_post_type('products', array(
		'label'=>'Products',
		'public'=>True,
		'show_ui'=>true,
		'show_in_menu'=>true,
		'menu_position'=>30,
		'supports'=>array('title', 'author'),
		'register_meta_box_cb'=>'motive_add_products_meta_box',
	));

	register_post_type('treatments', array(
		'label'=>'Treatments',
		'public'=>True,
		'show_ui'=>true,
		'show_in_menu'=>true,
		'menu_position'=>30,
		'supports'=>array('title', 'editor'),
		'register_meta_box_cb'=>'motive_add_treatments_meta_box',
	));

	register_post_type('questions', array(
		'label'=>'Questions',
		'public'=>True,
		'show_ui'=>true,
		'show_in_menu'=>true,
		'menu_position'=>30,
		'supports'=>array('title', 'editor'),
		'register_meta_box_cb'=>'motive_add_questions_meta_box',
	));