function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmad-Hosseini, Mohammad & Khanjani, Mohammad & Karamian, Roya', 5],
    ['Akbari, Ali & Irani-Nejad, Karim Haddad & Khanjani, Mohammad', 1],
    ['Darbemamieh, Maryam & Hajiqanbar, Hamidreza & Khanjani, Mohammad', 8],
    ['Darbemamieh, Maryam & Kaźmierski, Andrzej', 3],
    ['Ripka, Geza & Laniecka, Izabella & Kazmierski, Andrzej', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);