function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cargill, D. Christine & Söderström, Lars & Hagborg, Anders', 1],
    ['Ibarra-Morales, Ariadna', 2],
    ['Jarvis, Charlie', 1],
    ['Peng, Tao & Zhu, Rui-Liang', 4],
    ['Rimac, Anja & Šegota, Vedran & Alegro, Antun & Koletić, Nikola', 1],
    ['Söderström, Lars & Hagborg, Anders & Konrat, Matt Von', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);