function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bahls, Loren', 1],
    ['Glushchenko, Anton & Mironov, Andrei & Kuznetsova, Irina', 1],
    ['Gong, Zhijun & Li, Yanling & Metzeltin, Ditmar', 5],
    ['Grizancic, Lana & Baricevic, Ana & Smodlaka Tankovic, Mirta', 1],
    ['Silva, Weliton Jose da & Jahn, Regine', 11],
    ['Solak, Cüneyt Nadir & Balkis-Ozdelice, Neslihan & Yilmaz, Elif', 2],
    ['Videska, Anastasija & Zaova, Dušica & Naumovska, Hristina', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    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);