public function getLetter_string()
{
$res = '';
if ($this->comments) {
$res .= 'Clinical management: ' . $this->comments . "\n";
}
foreach ($this->getChildren() as $el) {
if (method_exists($el, 'getLetter_string')) {
$res .= $el->getLetter_string() . "\n";
}
}
return $res;
}