Please choose the correct ending to complete the given sentence: Health: [header] How to treat bruised ribs [title] Seek immediate medical attention if you have shortness of breath or chest pain. [step] A rib that's bruised or cracked is damaged, but still in its place in the rib cage. A broken rib, however, is dangerous because it's been dislodged from its normal position, and could potentially puncture a blood vessel, lung, or another organ.

Ending1: [substeps] If you've been injured and want to get emergency medical help right away, call 911 as soon as possible. [title] Determine whether you have shortness of breath. Ending2: [substeps] It's important to call emergency medical services as soon as possible. The blood vessels in your ribs can reform if you don't get medical attention. Ending3: [title] See your doctor if you're having trouble breathing. [step] If you feel sharp pain shooting through the bone, you have inflammation, or you feel pain radiating throughout your body, seek medical attention right away. Ending4: Seek medical attention instead of attempting to treat yourself at home if you suspect your ribs are broken instead of bruised. [substeps] Lightly run your hands over your ribcage.

Answer format: ending1/ending2/ending3/ending4