function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmed, Raja Ben & Romdhane, Yasmina & Tekaya, Saïda', 1],
    ['Baturina, Maria A. & Kaygorodova, Irina A. & Loskutova, Olga A.', 2],
    ['Darabi-Darestani, Kaveh & Sari, Alireza & Sarafrazi, Alimorad', 1],
    ['González-Acuña, Daniel & Moreno, Lucila & Cicchino, Armando', 1],
    ['Grosser, Clemens & Pešić, Vladimir & Gligorović, Bogić', 1],
    ['Kaygorodova, Irina A.', 3],
    ['Kaygorodova, Irina A. & Fedorova, Lyudmila I.', 1],
    ['Madill, Jacqueline & Hovingh, Peter', 1],
    ['Oceguera-Figueroa, Alejandro & Kvist, Sebastian', 1],
    ['Philippi, R. A.', 1],
    ['Schenková, Jana & Sychra, Jan & Košel, Vladimír & Kubová, Nela', 1],
    ['Šatkauskienė, Ingrida & Rutkauskaitė-Sucilienė, Jurgita', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);