function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dedov, Ivailo & Antonova, Vera', 2],
    ['Ezzine, Issaad Kawther & Pfarrer, Beat & Dimassi, Najet', 3],
    ['Frank, Christa', 1],
    ['Hausdorf, Bernhard & Sauer, Jan', 8],
    ['Hesse, P.', 1],
    ['Maroulis, Leonidas & Vardinoyannis, Katerina & Karakasi, Danae', 5],
    ['Mattia, Willy De & Neiber, Marco T. & Groh, Klaus', 23],
    ['Mattia, Willy De & Pešić, Vladimir', 2],
    ['Neiber, Marco T. & Walther, Frank & Santana, Jesús', 1],
    ['Plazzi, Federico & Pedroni, Guido', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);