function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Al-Handal, Adil Y. & Torstensson, Anders & Wulff, Angela', 1],
    ['Ferreira da Silva, Juliana & Oliveira, Maria Angélica', 3],
    ['Grizancic, Lana & Baricevic, Ana & Smodlaka Tankovic, Mirta', 2],
    ['Lee, Sang Deuk & Park, Mirye & Lee, Jin-Young & Lee, Hoil', 1],
    ['Long, Ji-Yan & Williams, David M. & Liu, Bing & Zhou, Yang-Yan', 2],
    ['Makarkin, Vladimir N.', 2],
    ['Mateusz, Rybak & Natalia, Kochman-Kędziora', 5],
    ['Rautenberger, Ralf', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);