Table:
Crohn's disease
Other names	Crohn syndrome, regional enteritis, Leśniowski-Crohn's disease

The three most common sites of intestinal involvement in Crohn's disease.
Specialty	Gastroenterology
Symptoms	Abdominal pain, diarrhea (may be bloody), fever, weight loss[1]
Complications	Anemia, skin rashes, arthritis, bowel cancer[1]
Usual onset	20 to 30[2]
Duration	Long term[1]
Risk factors	Tobacco smoking[3]
Diagnostic method	Biopsy, medical imaging[1]
Differential diagnosis	Irritable bowel syndrome, celiac disease, Behçet's disease, nonsteroidal anti-inflammatory drug enteropathy, intestinal tuberculosis[1][4]
Medication	Corticosteroids, methotrexate[1]
Prognosis	Slightly reduced life expectancy[1]
Frequency	3.2 per 1,000 (developed world)[5]

Please read the table in this image and return an HTML-style reconstructed table in text.

<table border="1" cellspacing="0"> 
<tr> <th colspan="2"> Crohn's disease </th> </tr> 
<tr> <th> Other names </th> <td> Crohn syndrome, regional enteritis, Leśniowski-Crohn's disease </td> </tr> 
<tr> <th> Specialty </th> <td> Gastroenterology </td> </tr> 
<tr> <th> Symptoms </th> <td> Abdominal pain, diarrhea (may be bloody), fever, weight loss </td> </tr> 
<tr> <th> Complications </th> <td> Anemia, skin rashes, arthritis, bowel cancer </td> </tr> 
<tr> <th> Usual onset </th> <td> 20 to 30 </td> </tr> 
<tr> <th> Duration </th> <td> Long term </td> </tr> 
<tr> <th> Risk factors </th> <td> Tobacco smoking </td> </tr> 
<tr> <th> Diagnostic method </th> <td> Biopsy, medical imaging </td> </tr> 
<tr> <th> Differential diagnosis </th> <td> Irritable bowel syndrome, celiac disease, Behçet's disease, nonsteroidal anti-inflammatory drug enteropathy, intestinal tuberculosis </td> </tr> 
<tr> <th> Medication </th> <td> Corticosteroids, methotrexate </td> </tr> 
<tr> <th> Prognosis </th> <td> Slightly reduced life expectancy </td> </tr> 
<tr> <th> Frequency </th> <td> 3.2 per 1,000 (developed world) </td> </tr>
</table>