function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arriaga-Hernández, Stefan & Hernández-Alcántara, Pablo', 1],
    ['Erdoğan-Dereli, Deniz & Çinar, Melih Ertan', 4],
    ['Faulwetter, Sarah & Simboura, Nomiki & Katsiaras, Nikolaos', 8],
    ['Garcia-Garza, Maria Elena & de Leon-Gonzalez, Jesus Angel', 2],
    ['Mikac, Barbara', 1],
    ['Sardá, Rafael & Gil, João & Taboada, Sergi & Gili, Josep Maria', 1],
    ['Sikorski, Andrey', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);